CM6: Autocomplete (except descriptions)

[ashmind]

• [x] Basic autocomplete
• [x] Filter list by typed text
• [x] Commit chars
  • [x] Space
  • [x] Tab
  • [x] Dot
  • [x] Paren
• [ ] ~Suggestions~ => #143
• [x] Icons
• [x] Hotkeys
  • [x] Ctrl+Space
• [x] Tests