Move to 64 bit, MSVC 2017

Pairing not supported under Windows
Remove zlib dependency for Windows.

Fixes https://github.com/mavlink/qgroundcontrol/issues/7954

Better build files for android bitness including #define tagging

Disable Pairing code on Android 64 bit builds

Updates for Qt 5.12 and 64 bit

Fix bad push

No current android openssl 64 bit version

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Include prebuilt android OpenSLL libs

This is temporary until we get rid of it

All settings wired and persistent
Cleanup non Airmap builds

Move all airmap related stuff to its own directory

Add switch to QGCExternalLibs.pri to check whether 32bit or 64bit version of SDL should be used on windows

Even though it hasn't been supported forever, the files where still
being compiled

No signing support yet

This way QGC can support both PX4 and APM Flight Stack messages at the
same time.