Add typewriter_typing & rename typerwriter_mode to typewriter_scrolling
Divide keymap into Windows & Linux

These barely have any differences, so it's quite a hassle to maintain
two files. But it's a first time in trying to suppost OSX as well.
Disable more bindings

Specifically:
- expand selection & move to brackets
- bookmarks
- marks
Add \n at EOF
Improve examples
Add macro to toggle both modes
Disable goto & jump.

_Sigh._
Update README.md for 0.2