[IGNORE] Couple more casualties from the great merge of August 2019

[IGNORE] Updating straight skeleton menu and other smoke tests errors

[BUGFIX] Deleted temp attributes on *Disc Generator* and made materia…

…l paths optional.

[UPDATE] Added a warning to *RBD to FBX* if a user feeds the tool pac…

…ked geometry with invalid transforms on it. (Ex scale of 0) Also set the message node to promote errors & warnings to the top level.

[BUGFIX] *Motion Vectors ROP* now reloads files from the temp directo…

…ry before rendering the final atlas.

Merge pull request sideeffects#155 from sideeffects/docs

Merge branch 'docs' into Development

[BUGFIX] Hooked up cusping angle controls to geometry frozen using Fr…

…eeze Threshold in *Destruction Cleanup*

[IGNORE] Added missing test geometry

[NEW TOOL] Added *Extract Silhouette* SOP. It will like the name says…

…, extract the silhouette of the input geometry for the specified axis. Solution by user petz

[BUGFIX] Fixed case where *Maps Baker* would return empty normalmaps …

…when reprojecting a map, but the highpoly didn't have normals.