Update readme file.
Update issue 266
Fixed aligned_free crash while pointer is null.
Added pixel_format_invalid as -1.
Rename application to gui.
Developing on sample_app.
sample_app smoked with colorized triangle demo.
Fixed an crash error in d3d11_swap_chain deconstructor while present is not called before release.
Update issue 266
Now render_core returns immediately if color targets and DS target are all empty.
Create window was separate from gui::run.
Extract frame present/save and timer update code to draw_frame.
Added window::view_handle_as_void to return void* window handle.
Now gui mode works on colorized triangle.
Update issue 266
Fixed forward surface declaration in sample_app.h
Implements save_frame and save_profiling_result in sample_app.
Added quiting and mode-based camera rotation in colorized triangle.
Merge