Made Omni work in new tab page, fixed history issue, fixed rendering problem in certain sites (e.g. example.com), changed the suggested shortcut to Cmd/Ctrl+Shift+K (shouldn't override for existing users)
- previously, the formatting was mixed, with spaces and tabs in the same
file, and sometimes even on the same line
- seemed like the overall preference was for tabs, so converted all
files to use 1-tab indentation
- fix any mixed indentation errors
- fix any 2-tab / 4-space indentation errors to use 1-tab instead