-fixed code do cross compiling to android -fixed build with GCC (workaround) -added little benchmark -several small fixes -updated meson build (demos building, working with GCC, LDC and DMD) -added some meson options -added ImGUI bind for OpenGL3
-small gitingore fix
*added ImGUI styles *added new assets (fonts, shaders) *added cimgui.dll *added imports for bindbc-sdl (for WASM) *added simple demo *added demo launcher *added snake demo *impoved demo utils *added cimgui.bc library for WASM -improved wasm build script -small change in vector
