Fixed issue with converting UnrealTargetPlatform to string when parsing command line options
Added a TypeConverter for UnrealTargetPlatform
Added check if a typeconverter exists when parsing command line arguments
#rb ben.marsh
#jira none
#ROBOMERGE-SOURCE: CL 12383340 in //UE4/Release-4.25/... via CL 12383343
#ROBOMERGE-BOT: RELEASE (Release-4.25Plus -> Main) (v671-12333473)
[CL 12383347 by steve smith in Main branch]