Revert "GappsCheckerActivity: finish it if no notification is shown, and don't override onresume if we're not implementing our own"

This reverts commit fa39bcedf15d5fb2df9829a9bcaad44f2c10489a.
Revert "GappsChecker: move areGappsInstalled(...) to Utils and conditionally fire the GappsCheckerActivity intent"

This reverts commit 40e8cfd3ab6a67f8a8dda42a0ecca0d51383e9cf.
Revert "Refactor naming to "GappsCheckerActivity""

This reverts commit 7909e05a69926fe56353a6f04c04b8b9e79f98d0.
Revert "Fix whitespace"

This reverts commit 07ae937ac095f6bfa90eab01840f8a0730d30a80.
Revert "LOL: update GMS_CORE string to reflect actual gapps package"

This reverts commit cd794a35dcc5c687c72da0a584fc7d1bc7a06128.
Revert "VanirUpdater: add a notifier activity"

This reverts commit 1d64dae2293f290bfb6143a1c66ecf3281a620d8.
Revert "VanirUpdater: fix quicksetting update checks when set to manual"

This reverts commit 229ee0a72922c927d98a74956867d1252630f3a8.