[UE-18355] - Clicking on show viewport controls on mac comes up with missing page error on mac
#fix Prefixed URLs correctly with file:// in SLevelViewportControlsPopup
[CL 2644736 by Chris Wood in Main branch]
#jira UE-18728 - There is no way to center the pivot on a BSP brush
#jira UE-18932 - After updating an actor transform via the details panel, the transform widget in the scene doesn't move
[CL 2634053 by Richard TalbotWatkin in Main branch]
#jira UE-18353 - SaveBrushAsCollison keybind makes no sense because the builder brush is no longer a user-facing concept
[CL 2619945 by Richard TalbotWatkin in Main branch]
ADDED UE-14356 HLOD: Print user friendly message if you try build and meshes don't have have LODs
ADDED MergeStaticMeshComponets to MeshUtilities needed for next CHANGE
ADDED HLOD preview build step for maps, this only builds the clusters for previewing the settings
ADDED SphereComponent now takes into account min and max drawing distances
ADDED Global forward declares and removed local ones from HierarchicalLOD.h
ADDED Visualization to LODActor class, uses USphereComponent to render its bounds
ADDED IsPreviewActor flag to LODActor class, if true during cluster generation DrawSphereComponents bounds will be used instead of LODActor's
ADDED vertex duplication removal on import
ADDED vertex/index buffer cache optimization on import
CHANGED World.h now forward declares HierarchicalLODBuilder to minimize (re)compile time
CHANGED While building/merging actors HLOD system now takes the orginal staticmesh from previously merged LODActors, this to enable retrieving the correct LOD per mesh (related to UE-15398)
CHANGED HLOD Cluster generation process, now takes into account HierarchicalLODVolumes to exclude actors from cluster generation
CHANGED Renamed CalculateRawMeshTangents to ExtractMeshDataForGeometryCache
FIXED Crash where a nullptr actor was added to actors list for > LOD0 clusters
FIXED Bound creation for actor within a cluster used FVector.Size(), now used FVector.AbsMax()
MOVED FLODCLuster structure into seperate header and cpp file
[CL 2617884 by Jurre DeBaare in Main branch]
#jira UE-16413 - Applying materials to BSP takes a long time once shells reach a basic level of complexity
Previously, setting a material or its texture transform on a BSP surface triggered CommitModelSurfaces, which iterated all the ModelComponents in the level and caused (among other things) the physics state to be recreated, a very expensive operation. This is clearly unnecessary when only the surface material or texture transform has changed, so introduced a new path in which only the Material Index Buffers are updated for the level's UModel.
[CL 2613582 by Richard TalbotWatkin in Main branch]
#jira UE-16419 - If you right click on a vert to snap a pivot of a brush to that location, it will automatically reset the pivot back to the origin after your next mouse click.
#reviewedby Matt.Kuhlenschmidt
[CL 2612043 by Richard TalbotWatkin in Main branch]
Fixes for lots of existing modules by removing all dynamically loaded duplicates (this is probably not the correct solution, but is the safest).
#codereview robert.manuszewski
[CL 2610845 by Steve Robb in Main branch]
