Enabled parallel msbuild for Mac
Added HashCollection class that can hold and serialize a collection of content hashes
Added quick dependency checking to UAT build by hashing csproj, input and output files for all modules
Reduced some logging when not running with -verbose
#rb Ben.Marsh
[FYI] Ben.Marsh
#ROBOMERGE-OWNER: andrew.grant
#ROBOMERGE-AUTHOR: andrew.grant
#ROBOMERGE-SOURCE: CL 7290522 via CL 7290525 via CL 7292711 via CL 7292732 via CL 7308901
#ROBOMERGE-BOT: (v371-7306989)
[CL 7315952 by andrew grant in Main branch]
