* 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
* Follow Blender code style a bit more closely
* Fix mixed tabs and spaces
* Remove old README now that it's part of the script
* Make less tied to specific Blender version numbers
Using a capitalized app name fits the platform guidelines. Since macOS file
systems are case insensitive by default this should not break scripts that
assume lowercase.
