Resolve issues with image attachment transitions
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Use a counter as the transition name in
AttachmentItem. - Tapping partly covered images makes them pop up from under the cover which looks glitchy
- Under mysterious circumstances messages can overlap each other (or leave gaps) after a return transition to the conversation
- On Moto G 4G (API 22), the exit transition still uses sliding
- Fix shared element exit transition when the list position is lost (activity was stopped or made into fullscreen)
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Change shared element of return transition when fullscreen view was swiped to another image when returning - Return transition lands slightly below thumbnail when status bar is hidden
Subtask of #1237.
