Set target SDK to 28 to make Google Play happy

Fix write storage permission problem

Include prebuilt android OpenSLL libs

This is a Google Play store requirement as of November 1st, 2018.
https://android-developers.googleblog.com/2017/12/improving-app-security-and-performance.html

This reverts commit cc1fa959.

Fixes #5787

Renamed main activity class with a more appropriate name.

-we need a monotonically increasing integer for android versionCode and
this works better across multiple branches

-we need a monotonically increasing integer for android versionCode and
this works better across multiple branches

-fixes #2955

- fixes #2551

It now uses the sensor to maintain proper landscape mode.