`CWindowAndroid` is a mess and needs fixing

[AnastaZIuk]

TODOs:

• fix https://github.com/Devsh-Graphics-Programming/Nabla/blob/window_resizing/include/nbl/ui/CWindowAndroid.h#L33 otherwise it crashes when getManager is invoked
• better class hermetization, why we have stuff that should not be available by user placed in public section?

[devshgraphicsprogramming]

Examples/Engine doesn't need to run, just needs to compile.

We wont do any testing with running samples until we can get a hand on a Vulkan 1.1 x86 Android device.

[devshgraphicsprogramming]

screw android (for now)