- add ToolSceneQueriesUtil::FindWorldGridSnapPoint
- replace OverrideMetric in FBasePositionSnapSolver3 with more general CustomMetric struct, can be interpreted in various ways, update OverrideMetric usage sites
- Add RaySpatialSnapSolver::PointConstraintFunc, allows snapping to constraints (eg to world grid) after snapping to lines
- expose above in QuickAxisTranslater::UpdateSnap
#rb none
#rnx
[CL 10104134 by Ryan Schmidt in Dev-Editor branch]