Feature/run using play button

[Efratror]

Implements:

• Play and stop icons
  • Green triangle/arrow
  • Red square
• Buffered output to channel
  • Appends buffer content to a vs-code output channel using a interval to not overwhelm the output channel
• Sketch runner class
  • Copies the compiled sketch (java class) files from the server
  • Starts and stops a sketch
  • Pipes sketch output to a buffer
  • Sets buttons visibility depending on the sketch state (running or not)

Closes #4