asyncclick raises a custom runtime exception when exiting help. This suppresses reporting it.

For power strips, the autooff data needs to be requested from the
children.
Until we do that, we should not create these features to avoid crashing
during switch platform initialization.

This also ports the module to use `_initialize_features` and add tests.

Starts structuring the documentation library usage into Tutorials, Guides, Explanations and Reference.
Continues migrating new docs from rst to markdown.
Extends the test framework discovery mocks to allow easy writing and testing of code examples.

By courtesy of @steveredden:
#888 (comment)

Adds username and password arguments to discovery to remove the need to import Credentials.
Creates TypeAliases in Device for connection configuration classes and DeviceType.
Using the API with these changes will only require importing either Discover or Device
depending on whether using Discover.discover() or Device.connect() to 
initialize and interact with the API.

This will avoid crashing when some commands return an error on
multi-requests on child devices.

Idea from
https://github.com/python-kasa/python-kasa/pull/900/files#r1624803457

Adds some device fixtures by courtesy of @jimboca, thanks!
This is a slightly patched and rebased version of #441.

---------

Co-authored-by: JimBo <jimboca3@gmail.com>
Co-authored-by: sdb9696 <steven.beth@gmail.com>

Fixes an issue reported by @bdraco with the P100 not working in the
latest branch:

`[Errno None] Can not write request body for HOST_REDACTED,
ClientOSError(None, 'Can not write request body for
URL_REDACTED'))`

Issue caused by the number of multi requests going above the default
batch of 5 and the P100 not being able to handle the second multi
request happening immediately as it closes the connection after each
query (See #690 for
similar issue). This introduces a small wait time on concurrent requests
once the device has raised a ClientOSError.

## [0.7.0.dev2](https://github.com/python-kasa/python-kasa/tree/0.7.0.dev2) (2024-06-05)

[Full Changelog](0.7.0.dev1...0.7.0.dev2)

**Implemented enhancements:**

- Make device initialisation easier by reducing required imports [\#936](#936) (@sdb9696)

**Fixed bugs:**

- Do not raise on multi-request errors on child devices [\#949](#949) (@rytilahti)
- Do not show a zero error code when cli exits from showing help [\#935](#935) (@rytilahti)
- Initialize autooff features only when data is available [\#933](#933) (@rytilahti)
- Fix P100 errors on multi-requests [\#930](#930) (@sdb9696)

**Documentation updates:**

- Update documentation structure and start migrating to markdown [\#934](#934) (@sdb9696)

**Closed issues:**

- Simplify instance creation API [\#927](#927)

**Merged pull requests:**

- Add P115 fixture [\#950](#950) (@rytilahti)
- Add some device fixtures [\#948](#948) (@rytilahti)
- Add fixture for S505D [\#947](#947) (@rytilahti)
- Fix passing custom port for dump\_devinfo [\#938](#938) (@rytilahti)