[Perf] Add IID Lookup Optimization

[j0shuams]

This PR adds guid optimization to all assemblies that use cswinrt. Any time an interop assembly would call for a guid (GetIID, say), we replace that call with a look up in a static map from types to guids.

Using .targets, we run the patcher on a target assembly and pass along the references that assembly has, and copy out the patched assembly mid-build so that the one copied to the bin dir must be the patched dll.

The optimizer comes with an "opt out" in case we need to turn it off for any new issues that might arise in it. The opt out is "CsWinRTIIDOptimizerOptOut" and just needs to be set to "true" in the target assembly's project file.

For testing we know that a set of our unittests cover the codepaths used by the optimizer. The async tests and the storage file/folder tests cover the nontrivial code paths. We have also tested that the symbols files written by the optimizer for the patched dll are usable.

There is an addition to the TestComponentCSharp that arose from a bug in a tool used by the optimizer. The optimizer uses Mono.Cecil nuget package, and on version 0.11.3 of Cecil there was a bug writing long class names to pdb files. I added a new runtime class with a long, nonsensical name, and a unit test that would call for an event on this class. This reproduces the error we originally saw with 0.11.3, and verifies that the Cecil fix in 0.11.4 works for us.

Also, there was a version mis-match in the TestWinRT repo that caused local build issues. This was fixed by a PR on TestWinRT, and we reflect that by updating the commit used to checkout TestWinRT in our local .cmd.

Closes #686

[manodasanW]

Should we and can we run the IID optimizer on WinRT.Runtime?