Move R2RDump over to the new System.CommandLine

[AndyAyersMS]

The System.CommandLine used by R2RDump is a defunct corefxlabs project. We should move it over to using the new System.CommandLine.

Among other things this will unblock porting some of the jitutils over to this new command line parser (since PMI needs to be able to run in Core_Root environment). See dotnet/jitutils#209.

[AndyAyersMS]

cc @trylek

I've been porting over jitutils so can do this too, if you like.

[AndyAyersMS]

Here's my first attempt: R2RDumpNewCommandLine

I ended up moving all the command line stuff over to DumpOption. Had to rename some things to get their binding model working.

Feel free to give it a try. You will likely run into dotnet/command-line-api#532 so that needs to be fixed before we can move forward.

In particular using the [parse] directive is kind of interesting:

dotnet exec D:\repos\coreclr\bin\Product\Windows_NT.x64.Debug\netcoreapp2.0\R2RDump.dll [parse] --in foo.dll -x -v -d -q bar -q baz --diff
[ R2RDump [ --in <foo.dll> ] [ -x <True> ] [ -v <True> ] [ -d <True> ] [ -q <bar> <baz> ] [ --diff <True> ] ]

[trylek]

Thanks so much @AndyAyersMS, it looks great to me, feel free to merge it in if it works for you; I doubt there are too many other users of the tool out there right now and we / they should get easily adjusted to the new syntax. After all I believe the pre-existing command-line syntax is super-overcomplicated and I'd love to clean that up somehow, I'm just somehow lacking the spare cycles to look into that :-(.

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