This bumps the version number of thirdparty-imgui in Gradle and adds
imgui_stdlib.cpp into the sources in CMake, as well as adding a new
include directory.
These hide the platform specifics behind a common C++ API. Platforms:
- Windows: DirectX 11 (with 10 backwards compatibility)
- Linux: OpenGL 3
- Mac: Metal
The field image and robot image can be loaded or just a wireframe used.
The robot can be moved and rotated with a mouse click + drag.
The robot position is settable in robot code via the Field2d class.