Add unigi_input_mouse_capture

input.c

@@ -0,0 +1,8 @@
+void unigi_input_mouse_capture(unigi_type_bool captured) {
+	if (captured) {
+		SDL_WM_GrabInput(SDL_GRAB_ON);
+	} else {
+		SDL_WM_GrabInput(SDL_GRAB_OFF);
+	}
+	SDL_ShowCursor((captured == 0));
+}

main.c

@@ -5,6 +5,7 @@
 #include "graphics.c"
 #include "time.c"
 #include "events.c"
+#include "input.c"
 
 unigi_type_error unigi_init() {
 	return 0;