changes to jump system

jumpdest on the jump system is now used to load the correct scene after the hyperspace tunnel sequence has completed.
Its set from the plottingdisplay console and no longer by the jumpgate you fly through

removed the ability to fail out of jump early by hammering the jump controls wrongly.
more work on comet scene

jumps are now related to the map, left route goes via comet, right via mars
comet has animation in hyperspace
reworked all of hyperspace event stuff. Will be easier to add new ones in the future