Support loading sketches from rss/atom feeds #3939

Job	Run time
Configure Build Parameters	34s
Windows OpenXR	7m 36s
Windows Pimax	8m 4s
Windows Rift	7m 59s
Linux	7m 47s
MacOS	8m 21s
Android OpenXR	24m 53s
Oculus Quest (1)	22m 3s
Oculus Quest (2+)	25m 36s
Android Pico	23m 49s
Android Pico (CN)	23m 35s
iOS Zapbox	3m 15s
Publish changelog from last major build to open-brush-docs	0s
Sign the MacOS .app	0s
Publish Pimax Release	0s
Publish Itch.io Release	0s
Publish Oculus Quest 2+ Release	0s
Publish Viveport Release	0s
Publish Oculus Quest 1 Release	0s
Publish Oculus Rift Release	0s
Publish Zapbox iOS	0s
Publish Pico Releases	0s
Create and Notarize DMG	0s
Publish Steam Release	0s
Create Github Release	0s
	2h 43m 32s

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