Build scripts download SDL, download (or build) premake5, generate projects, then build, in several configurations and platforms
Project now builds with premake5 instead of premake4 to allow VS2015 project generation
Tweaked SDL directory dependency to work better with CI
Update README
Detour: Prefixed static nav with 'dtStat', this includes polys and poly refs too.
imgui: Made imgui code not to use id:s anymore, since there were way too many id clashes.
imgui: Separated the rendering code into its' own file, changed prebaked font to use stb_truetype instead, removed glfont.
imgui: Added 'disabled' property to widgets.
Recast: exposed single triangle rasterization into the recast api.
Demo: Changed the debug draw validation to be "soft", easier to demo now.