[tern addon] Fix fetching of parser state

Issue #1799
[sql mode] Add comment style properties
In refresh, recompute line heights when no known text height

Issue #1793
[matchtags addon] Don't match tags when there is a selection

Closes #1802
[css-hint addon] Add

I have created this simple css autocomplete/hint that uses data from
the css mode. Autocomplete works for both properties and values - but
it does not filter the values by property. Better than nothing for
now.
[css-hint addon] Integrate
[closetag addon] Restructure
[closetag addon] Allow closing by typing / even when before a word

Closes #1795
[haskell mode] Allow keyword sets to be overridden
[continuecomment addon] Clean up, support line comment blocks