Limiting with vsync is apparently unreliable on a number of systems;
this resulted in high CPU/GPU usage.
Also add current actual frame rate to about dialog of GUI tools.
- Twine, StringRef, Format, and NativeFormatting have been removed
- Logging now uses fmtlib style formatting
- Nearly all uses of wpi::outs/errs have been replaced with fmt::print() or
std::puts()/std::fputs() (for unformatted strings).
- A wpi/fmt/raw_ostream.h header has been added to enable
fmt::print() with wpi::raw_ostream
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
