Update shortcuts

Remove experimental stuff, group things.
Remove unused imports
Fix find_word_commands when not at word
Move word_*() utils and list_cursors() to viewtools

Get rid of old word_after() and word_before()
Move line_*() utils to viewtools
Organize things a bit better in viewtools
Refactor move_word_* commands to use new word_*() utils
Remove outdated regions select_(up|down) commands
Move line, block and region utils to viewtools
Refactor move_block_* and delete_block commands
Move scope commands to scopes, rest for reform
Extract TODO