Project arg is now optional and will simply sync the engine.
Passing -CL=0 will now require the -force argument before syncing files out of the workspace.
Fixed issue with deep samples (e.g AREnvProbe) not being discovered by FindProjectFileFromName
Added NativeProjects.ClearCache option for the case when syncing a project from P4 that isn't yet on disk
Fixed issue with P4.FileExistsInDepot returning true if passed a path that isn't in the users client view. Relates to UE-78832 but not the entire fix
Fixed issue with BuildEditor not working without a project arg.
Fixed issue building projects that don't have source
#codereview ben.marsh
#jira UE-78832, UE-78826
#rb na
[CL 8008332 by Andrew Grant in 4.23 branch]
Quality of life improvements for Mac / Linux that missed the initial 4.23 branch.
- UAT scripts now in project root
- SyncProject script moved out of NotForLicensees
- SyncProject script deals with writable build version files
- SyncProject script now treats -cl as optional argument (if omitted sync is to #head)
- Helper scripts for Building, opening the editor, and creating a p4config file.
#jira UE-37807
#rb na
[CL 7633933 by Andrew Grant in 4.23 branch]
