Superhost for Windows & Mac

[agocke]

All native runtime libraries should be statically linked into a single file host for Windows & Mac.

• Make clrjit and coreclr friendlier to static linking on multiple platforms. Reducing DllMain responsibilities, so that singlefile would not need it #43423
• Statically link clrjit and coreclr into singlefile host Link clrjit.dll and coreclr.dll into Windows/Mac host #43072
• Link native libraries in a way that is multiplatform friendly. Improving and unifying handling of native Libraries code in embedded/singlefile scenarios #41299
• Statically link native libraries on Windows, OSX and other platforms that we test/support. Statically link native libraries into singlefilehost on OSX and Windows #43699
• Move build of hosts to clr partition. Hosts, in particular statically linked ones should be built in clr partition. #43700
  (not a requirement but will make things simpler going forward, hard to do though before we do the above)
• Signing on MacOS Single-file: Facilitate signing on mac #3671
• Investigate compression of hosts

Partner dependencies:

• Debugging support (WinDbg/lldb)
• Watson support

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[danmoseley]

Making user story so it appears in the tree