[engine]Remove conditionals for key definitions on iOS. Will fix it later when work on input is done.
[engine]Add 'dependencies.h' dependency in an explicit manner, not from indirect inclusion
.gitignore extended for iOS
[dependencies]Update SDL
[iOS]Share project schemes
[iOS]#60, #61, #59, #62,  Changes to code and XCode project to compile GLES iOS static library.

Set up code sharing for texture building and OpenGL manager SDL setup code. Also temporarily enabled GL ES 1, which is more similar to
OpenGL 1.5 desktop, thus less code to change, and display something on screens.

Work to be done at this state:
- Run on device, present a loaded window. Code just compiles now
- Run all tests on iPad (resolution is 1024-768, so all tests fit perfectly), this needs paths loading change, as assets must be in bundle for iOS, not outside it.
- Setup GLES 2 shaders, incompatible API, run same tests in GLES2
- Implement coordinate-point ratio, to run same tests on device
Merge branch 'iossetup' of github.com:DarthMike/indielib-crossplatform into iossetup