Merge pull request #19 from h4mu/weapon-cycling-keys-1460010345942177…

…8061

Add next/previous weapon cycling keys

Merge pull request #18 from h4mu/fix-mouse-move-sdl-3269861212548935376

Fix mouse move in SDL implementation

SDL 2.24.0 and SDL mixer 2.6.2

Music for Android and automatic release page with APKs

Command line arguments and custom content support as well as changed …

…target API level to 28 to avoid warnings on newer devicees

Disabled accelerometer joystick

removed mips64 ABI from travis build as it is buggy

fixed a stack overflow

content manager supports full versions