iOS first run

[Try]

I've added basic most support for iOS in engine. Build process is still hairy, yet it getting close:

Build

1. Generate xcode-project
   cmake -H. -B./out/xcode-ios -G Xcode -DCMAKE_SYSTEM_NAME=iOS

2. Select Gothic2Notr as startup project. You may need to specify development-team in Signing & Capabilities section.

3. Copy gothic2 game files via Finder (you should be able to see OpenGothic folder now):
   

4. Run the game
   Note: input is not yet done, so you wont be able to pass further than a main menu. So, at this point iOS installation, is only iusefull for development purposes.

UPD:
build process now simplified - 4 steps instead of 7

[Try]

iPhone7
Most of time crashes with startup timeout (shaders take too long to compile apparently) or with OOM. But when it works:

[Try]

After GDR update, now game runs into. driver crash: https://developer.apple.com/forums/thread/750478

[Try]

Filed feature request to google, for valid CMake support on android: https://issuetracker.google.com/issues/353730410
(need to have at least as good as iOS)