-Add lightmapper

-Fixes to unwrapper (remove degenerates), makes Thekla not crash
-Added optional cancel button in EditorProgress
-Added function to force processing of events (needed for cancel button)

platform/windows/os_windows.cpp

@@ -2156,6 +2156,10 @@ void OS_Windows::swap_buffers() {
 	gl_context->swap_buffers();
 }
 
+void OS_Windows::force_process_input() {
+	process_events(); // get rid of pending events
+}
+
 void OS_Windows::run() {
 
 	if (!main_loop)