Caused by rB46102cf4e0c4 [which removed the check if the image can
actually be loaded].
Maniphest Tasks: T70903
Reviewed By: campbellbarton
Differential Revision: https://developer.blender.org/D6089
Allow different splash heights, without this changes the the
default splash would stop app templates splash screen from loading.
This also allows the default splash height to change without
manually editing the layout.
* Auto detect rc and release version cycle in BKE_blender_version.h.
* On Windows, generate zip and installer if a release is detected.
* On macOS, always generate a dmg instead of zip.
* Use standard package names without hash if a release is detected.
* Buildbot package names now match platform names in releases.
Ref T67056
Differential Revision: https://developer.blender.org/D5643
