$D013-Stable-Interrupts added..

After wondering why some parts of Crest Light bugged, I had to learn that there is another way to create stable rasters using CIA1 and LP (in short: you can trigger an update of $d013 (LightPen X) and $d014 (LightPen Y) by changing bit 4 of Port B of CIA1, as this Pin is connected to the LP-In of the VIC). Before, four parts of Crest Light where buggy, now the whole demo runs perfect.

Some screens: