* Always show the mouse cursor when the mouse is disabled

* Rename IN_StartupJoystick to IN_InitJoystick, add IN_ShutdownJoystick
* Add IN_Restart, which avoids calling IN_DeactivateMouse at the wrong time
* Call IN_Restart when changing r_fullscreen
* Add CVAR_ROM r_sdlDriver for easy checking of the SDL driver in use
* Random README tweaks

code/null/null_input.c

@@ -30,6 +30,9 @@ void IN_Frame (void) {
 void IN_Shutdown( void ) {
 }
 
+void IN_Restart( void ) {
+}
+
 void Sys_SendKeyEvents (void) {
 }