This fixes an issue with scaling on Retina displays where the frame
buffer size was double that of the window size, resulting in a content
scale factor of 2. This scale factor caused elements to appear too
large, even on the smallest zoom setting.
This change does not affect external monitors on macOS because the
reported content scale was 1 anyway.
This makes code easier to read and more consistent between C++ and Java.
Also update clang-format settings to always add a line break (even if no braces are used).
The platform-specific code now only has create, update, and delete texture.
Image reading functions have been moved to common code.
Also add pixel data functions and image data functions in addition to image
file loading.
These hide the platform specifics behind a common C++ API. Platforms:
- Windows: DirectX 11 (with 10 backwards compatibility)
- Linux: OpenGL 3
- Mac: Metal
