Numerous Halo Updates

Commits by: @drcmda

Commit descriptions below:

HALO hide bugfix, smaller numberbatch still

HALO cleanup & better drawables

HALO hiddenstate-fix + smaller numberbatch

HALO Style revamp

- speech bubbles are centered
- number batches are roundand simplified, same color as in g+
- markers appear as dots above the bubble
- hiding and dimissing triggers text hints
- couple of bugfixes

WARNING: some of the drawables are good for xhdpi only for now and must
be scaled down for the other resolutions

Change-Id: Ib656664f6f8c42b747df18d65d1e3fb40cb7480c
Some Halo color options

Change-Id: I4d0aa17d27aad00b55a54401cfa88ebb737e36dd