Feature Request: Autorsizing Text-Area and pressing TAB should insert a tab-stop or some spaces

[zeitwesen]

I use microbin mainly for note-taking. Thereefor I miss the following features:

• Auto-Resize height of Text-Area
  In this usecase it would be great to have the text-area autoresize in respect to the amount and height of text that is input into it.

• Pressing TAB-Key to add Tabstops
  Also it would be great if it would support adding Tabs when pressing the TAB-Key. So I can use it to make structured notes.

• Save (upload) when pressing Crtl+S or Apple+S
  So fastly save the input text it would be great if it could save when pressing the mentioned key-combinations.