Vim refactor and enhancement

[rebornix]

Tasks for May milestone

• Vim commands refactor (Refactor #1642)
• bug fixes
  • diw on trailing whitespace deletes newline diw on trailing whitespace deletes newline #1630
  • navigate between views fe2a5c5
  • statusBarColors should stay in user settings statusBarColors modifies workspace settings.json #1565
  • support linewise :sort Linewise visual mode :sort not supported #1592
  • do not show undefined in easymotion easymotion 'b' start of word backwords shows undefined marker for large files #1627