Introduce PlayCore and In-App Updates#746

Draft

keyboardsurfer wants to merge 3 commits intomainfrom bw/introducePlayCore

+774-152

Commits on Jul 8, 2019

Add playCore dependency
keyboardsurfer
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Commits on Jul 10, 2019

Initial implementation of In-App Updates
keyboardsurfer
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Commits on Jul 17, 2019

Introduce FeedViewHolder
keyboardsurfer
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