Tying the start-of-episode cutscene to the cluster does not really work because it gets triggered by all maps of the cluster.
All currently existing intro cutscenes are tied to the map anyway.
Also correcting transition movie name for RRRA E2L1.
* fixed frame gaps when exiting a cutscene. This must be properly synchronized with the state handler in the main loop.
* reactivated the loading screens. With texture precaching working the delay when loading a map becomes significant enough to require a visual feedback.
* RR does not play 'bonusmusic' on its summary screen.
