Merge branch Mario/qc_droptofloor (XS merge request)
Mostly 1:1 port of the builtin droptofloor
, with the exception of SV_NudgeOutOfSolid
(a function which is unused in Xonotic's physics code).
Removes one of the final direct references to the self
entity, a global relic that has been mostly abolished from Xonotic's codebase.