FMod - Level Inspector for switches

One new level creator had some trouble with switches in Keen 4. Unlike episode 6, episodes 4 and 5 have two different kinds of switches: one that affects the infoplane (to control moving platforms) and one that affects the foreground (to open/close bridges). Using the wrong kind of switch will produce absolutely no visible effect. To make navigating this issue easier for new modders, I added some new checks to the Level Inspector. It will now warn about pointerless switches, switches that point outside the level, and switches with the wrong kind of target.