Fixes earlephilhower#758

Fixes earlephilhower#768

rp2040.reboot() would set a reboot timer for 100ms in the future, but then
return to user code and ran it until the timer expired.  Now infinite loop
until the WDT fires.

Takes a list of APs, finds the one with highest RSSI, and tries to connect.

There may be an issue in the CYW43 driver that causes a link to never be
reported as going down once it has connected, when it was disassociated or
when the wlan shuts off unexpectedly.

Work around it by clearing the internal link active in a TCP callback for
the CYW43 driver.

Reports disconnection properly now, as well as reconnection.

Fixes earlephilhower#762

Fixes earlephilhower#767

According to the Arduino docs, update works just like put, but it first checks if the value is different from the current one.
This is how our put already works, so we just alias update to put and we're done.
Function added to be more compatible with the Arduino API.
Also see earlephilhower#778

Add a simple DNS server for AP mode
Point DHCP server DNS entry to GW for DNSServer

If the WiFi network is already up, don't run the scan and connection
algorithm in WiFiMulti.

Remove the need to have a separate WiFiClient that's destroyed after
the HTTPClient.  Let the object handle its own client, and pass through
any SSL requests.

Also supports the original ::begin methods which need a
WiFiClient(Secure) to be passed in and managed by the app.

Give a meaningful error when OTA is attempted against a chip which does
not have a filesystem configured.

Force the builder to include the path where we build the signing header.

Undo a breaking bug in the Updater class (TBD fix in ESP8266)

Fixes earlephilhower#783

OTA text error messages were getting lost because they were sent in
multiple UDP packets, one per print(). Now collect the full error and
report in a single print, allowing text messages to appear in ESPOTA.

* Add HTTPUpdate class to pull updates from HTTP(S)
* Increase GH runners for pulls
WiFi builds and examples are taking some serious time now
* HTTPUpdate tests build on Pico W

…ure (earlephilhower#791)

* Add HTTP-parser lib to support ESP32 WebServer
* Add WebServer from ESP32.  Only supports HTTP
* Separate HTTP server from the network server
Instead of managing the WiFiServer/WiFiServerSecure in the same object
as the HTTP handling, split them into separate objects.  This lets
HTTP and HTTPS servers work without templates or duplicating code.
The HTTP block just gets a `WiFiClient*` and works with that to only
do HTTP processing, while the upper object handles the appropriate
server and client types.
* Add HTTPS server
* Clean up some THandlerFunction refs
* Refactor into a template-ized WebServer/WebServerSecure
* Add DNSServer examples which need WebServer
* Fix CoreMutex infinite recursion crash
Core could crash while Serial debugging was going on and prints were
happening from LWIP/IRQ land and the main app.
* Add HTTPUpdateServer(Secure)
* Add MIME include, optimize WebServer::send(size,len)
When send()ing a large buffer, the WebServer::send() call would
actually convert that buffer into a String (i.e. duplicate it, and
potential issues with embedded \0s in binary data).
Make a simple override to send(size, len) to allow writing from the
source buffer instead.
* Fix WiFiClient::send(Stream), add FSBrowser example

Fixes earlephilhower#797

Allows the IDE to detect boards when using the Keyboard, Joystick,
or Mouse libraries.

Thanks @DaleMitchell for the idea!

…ephilhower#798)

Fixes earlephilhower#795 

Replace all CoreMutex and Newlib mutex accesses with FreeRTOS calls
when in FreeRTOS mode.  Avoid issues with hange/etc. due to priority
inversion.

No changes to normal operating mode.

Add a FreeRTOS stress test that caught the issue fixed here.

Don't try and heap allocate temporaty <16b chunks.

Merge in changes @chrisckc debugged while working at 400khz on his own project.
See earlephilhower#979 (comment)

Go back to UNIX format endlines.  No functional changes.

…r#1013)

Supersedes earlephilhower#972.  Thanks @kholk

Instead of sending a single packet per byte, send out larger chunks to
TCP/IP while doing a ::write(Stream).

Fixes earlephilhower#999

…#1029)

When receiving a `QUIT` message, the main thread was trying to tell   
the scanner thread to quit - however, what it was actually doing was
creating a local variable that shadowed the global flag used by the
scanner thread. Fix that by ensuring that the main thread uses the
global variable instead.

Fixes earlephilhower#1028

Previously, File::readString used a C-style string as an intermediate
buffer via the String += operator. This treats a NUL byte as a
terminator, making this function work incorrectly if the File contains
binary data.

This commit switches the function to use String::concat, which doesn't
treat NUL bytes any differently (and is a bit faster, because it doesn't
need to use strlen).

Fixes earlephilhower#1021

The UART hardware will push characters into the receive FIFO even if there
are parity, framing, or other errors.  These are invalid and shouldn't be
returned to the application, so drop them if errors detected.

This will also avoid the glitch-induced initial garbage character.

SingleFileDisk allows for exporting a file from the onboard LittleFS
filesystem to a PC through an emulated FAT drive when connected.  The
PC can open and copy the file, as well as delete it, but the PC has no
access to the main onboard LittleFS and no actual on-flash FAT
structures are used.

This is handy for things like data loggers.  They can run connected to
USB power for some time, and then connected to a PC to dowmload the CSV
log recorded.

It's almost 2023, allow LFN (long file names) on the emulated USB disk.

Reduce the disk buffer size to 64 bytes.  The buffer is statically
allocated so it's always present, even in non-USB disk mode, meaning
all apps will pay the RAM price for it.  64 bytes is slower to read
but works and saves ~1/2KB of heap for all apps.

Fixes earlephilhower#1031, or at least covers the case of slower associations.

Other parts of the core use temp 256 byte chunks to transmit/move/operate
on data, so do the same here.  Will increase effective WebServer sendFile
speeds.

Fixes earlephilhower#963

The available space calculation didn't account for the fact that one
of the buffers was currently being output, causing ::available() to
be too large and ::write() to block in that case.

…tion stability (earlephilhower#1046)

* Modified LowPowerMode functions in WiFiClass.cpp/.h

* Added noLowPowerMode() in the WiFiClass::begin()/beginAP()

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