We upgrade compileSdkVersion to Q, but keep targetSdkVersion as 28.
The reason is because targeting Q will no longer allow us to execute
native binaries in an app's private data, which Magisk Manager relies
a lot for performing stock boot image patches in non rooted environment.
For more information regarding this issue, check this link:
https://redd.it/b2inbu
Some workarounds has been discovered (https://github.com/termux/proot),
however for the time being there is no point to introduce these huge
hacks just for targeting Q, which we don't benefit anything.
Android 4.1 init miss several significant features Magisk reply on,
so the final decision is to forget about it in the future.
Pull minSdkVersion of Magisk Manager back to 17 and remove some
unnecessary adjustments done for SDK 16