Slopes 'n objects
Solid objects are now no longer selectively intangible on slopes. (This is the bug I found in 2.2's DSZ1, for those who were present in 'fun/'dev when I was complaining about it.)
HOWEVER, since these changes to PIT_CheckThing do raise questions about whether there may be unintended side effects here, and if so how severe. As a result, I may remake this for internal only if necessary.