Tcod

Fixed
- Simplified libtcod's system calls which should fix support for Microsoft's
UWP.

Fixed
- Libtcod's CMake config file is now aware of its dependencies.

Fixed
- The `SDL_WINDOW_ALLOW_HIGHDPI` flag has been added to SDL windows created
with the non-context API. This fixes issues on some MacOS systems.
[90](https://github.com/libtcod/libtcod/issues/90)

Fixed
- Fixed the case-sensitive file name `LibtcodConfig.cmake.in` which was causing
CMake to fail.

Added
- SCons builder now supports MacOS ARM64 and Universal 2 architectures.

Changed
- `TCOD_sys_get_current_resolution` now returns error codes.

Deprecated
- Deprecated `TCOD_sys_get_current_resolution`

Fixed
- Code points from the Private Use Area will now print correctly.
- Fixed regression in `TCOD_sys_get_current_resolution` behavior. This
function now returns the monitor resolution as was previously expected.
- The OpenGL 2 renderer was ignoring `SDL_HINT_RENDER_SCALE_QUALITY=nearest`.

Removed
- `TCOD_rng_splitmix64_next` has been marked as provisional.

Deprecated
- Deprecated the zip functions.

Fixed
- Context functions won't crash when methods are missing.