Support for multi-select in the conversation list.

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Closes #1601
Closes #2214

Fixes #2188
Fixes #786
group visual fixes

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Merge pull request #2276 from mcginty/group-meta-colors

group visual fixes
Fix for old-skool SMS key exchange UI behavior.

Also fixes SMS "end session" messages failing to end session.

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Bitmap OOM and rotation fixes

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