nanogui ~glfw-backend

D port of nanogui

The port is incomplete - not all widgets are ported, but all ported widgets are fully usable.

There is difference with origin. For example:

• instead of const references passing by value is used
• as a color and vector implementation gfm.math is used (in origin eigen used as a vector implementation and own implementation of color type)
• no locking on glfw, instead two backends are available - arsd.simpledisplay (no external dependencies) and SDL2 (depends on SDL2 library obviously)

Examples

Two examples added:

• arsd.simpledisplay based, run it using dub --config=arsd
• SDL2 based, run it using dub --config=sdl