Haiku R1 Beta 4 is inching closer…

Versioning: Add BETA_4 and PRE_BETA_5 version constants.

UPDATE: Even closer…

docs/develop: Add missed item to the branch steps and combine the last two.

Enable “HAIKU_OFFICIAL_RELEASE“

UPDATE: R1/Beta4 is now in ‘testing’…if you can help, grab it here and send your feedback…

https://discuss.haiku-os.org/t/help-wanted-haiku-r1-beta4-boot-hardware-testing/12658