C2LC-37: Remove components not used in 0.1 from App.js

Description

Remove:

  • Menu for selecting editor mode
  • EditorContainer (use a ProgramBlockEditor directly)
  • TurtleGraphics
    • Also remove calls to register interpreter command handlers for the turtle
  • Speech recognition switch and supporting code
  • MicMonitor
  • Control for changing language

Remove any no-longer-needed event handlers and component state values.

Leave the unused component source files and tests in the project repo – just remove their usage from App.js.