Remove common.gypi, use single gyp file
Implement openuwsc::get_window_list (Win)
Add function openuwsc_btn
Add functions openuwsc_mpos and openuwsc_peekcolor
Add function openuwsc::create_image
Add function openuwsc_image_create_with_bitmap_file
Add function openuwsc_chkimg
Refactor: use functions, get_{red|green|blue} and make_rgb
Declare 'OPENUWSC_UNUSED' macro
Add functions, openuwsc_kbd_status and openuwsc_kbd
Add function, openuwsc::get_screen_size
Modify openuwsc_chkimg function, use pointer for optional parameters
Fix bug: openuwsc_chkimg gives wrong coordinate
Fix bug: openuwsc::load_bitmap_file doesn't work on Windows
Cleanup
Update Xcode options
Add Doxyfile