These functions were placed in UnitMotion, which had nothing to do with
range checks and made them available only to moving entities for no
particular reason.
This patch also adds support for square-square range checks and
shape-shape distance checks.
Modified from a patch by bb on top of work from wraitii.
Differential Revision: https://code.wildfiregames.com/D981
This was SVN commit r22345.
Use the distance to the nearest point on the dropsite's obstruction
rather than the center of the dropsite.
Differential Revision: https://code.wildfiregames.com/D1160
Reviewed by: wraitii
Comments by: bb, elexis
Fixes: #4592
This was SVN commit r20950.
