* If invoked from VS2022, use visual studio to build UnrealBuildTool to prevent unnecessary rebuilds
* If invoked from VS2019 or on the command line without visual studio, use bundled dotnet to build
* Deduplicate all logic into Build.bat, and have Clean.bat and Rebuild.bat call Build.bat with either -Clean or -Rebuild
* Print entire dotnet version
* Replace various calls to dotnet msbuild with dotnet build
* Update old UE4 comments
#jira UE-165754
#rb ?
[CL 22387871 by joe kirchoff in ue5-main branch]
Added a set of netcore csprojs to BuildUtilities and DotnetUtilities that build to a seperate output folder. This allows other tools to still target .net framework (like UAT for instance).
UBT is still by default targeted as .net framework.
Note that UBT built for net core has a different output directory Engine/Binaries/DotNet/UnrealBuildTool/UnrealBuildTool.exe - this is due to how a netcore project output looks with signficantly more files that are related to that application (that would be overwritten if using a shared directory).
To opt in to this set UE_USE_DOTNET=1 environment variable.
Please note that due to the changed output directory a lot of tooling will likely break at this point.
#rb ben.marsh
[CL 14419918 by Joakim Lindqvist in ue5-main branch]
