Basic autocomplete in SQL Query editor

- Autocomplete SQL keywords using CodeMirror hint addon
- Inline, footer SQL editors are not included
- Table/Database names completion is not implemented
- Added autocompletion to console, inline SQL editor, create view dialogue
- Autocomplete on `inputRead` instead of `change` event.

Signed-off-by: Nisarg Jhaveri <nisarg.jhaveri@research.iiit.ac.in>
ChangeLog entry

Signed-off-by: Marc Delisle <marc@infomarc.info>