Add scrollbars to algorithms menu and visualization viewer#250

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ALMerrill wants to merge 3 commits intoalgorithm-visualizer:masterfrom

ALMerrill:add-scrollbars

Commits on Jun 5, 2019

added scrollbar to algorithm menu on left
Andrew
committed
Added scrollbar to visualization viewer
Andrew
committed

Commits on Jun 6, 2019

added scrollbar to each tracer
Andrew
committed