Tag suggestions: Matches should be case insensitive

[codebykat]

Fix

Tag suggestions should be case insensitive. Quick fix by lowercasing all the comparison strings before comparing (since startsWith doesn't have a flag for case sensitivity and moving to regex seemed overly complex). Added a test for this too.

Test

1. Search for the name of a tag but with different case.
2. Verify tag suggestions suggest the tag.
3. Smoke test for other regressions involving search and tag suggestions.

Release

RELEASE-NOTES.txt was updated in TBD with:

Fixed tag suggestions to be case insensitive

[belcherj]

Looks good. I was trying to think of a way to pull out name into a variable and lowercase it only once but nothing I thought of made it any cleaner.

[dmsnell]

For the time being I don't see it being a problem to call toLowerCase() on every tag because we're going to have to do some kind of string op on every one each time we change the search field text.

if/when we move searching into a WebWorker this will all change. see #1835 for an example