feature: Now generating base classes correctly, and passing instance members

[glennawatson]

|                Method |     Mean |    Error |   StdDev |     Gen 0 | Gen 1 | Gen 2 | Allocated |
|---------------------- |---------:|---------:|---------:|----------:|------:|------:|----------:|
| MultipleDirectoryCase | 737.3 ms | 13.78 ms | 12.22 ms | 1000.0000 |     - |     - |   4.23 MB |

So a total revamp of the nuget package input system. This is before we did the base class processing:

|                Method |     Mean |    Error |   StdDev |   Median | Gen 0 | Gen 1 | Gen 2 | Allocated |
|---------------------- |---------:|---------:|---------:|---------:|------:|------:|------:|----------:|
| MultipleDirectoryCase | 976.6 ms | 58.94 ms | 167.2 ms | 887.9 ms |     - |     - |     - |   3.93 MB |

This was the last release after we turned on dependency inclusion

|                Method |    Mean |    Error |   StdDev |     Gen 0 |     Gen 1 |     Gen 2 | Allocated |
|---------------------- |--------:|---------:|---------:|----------:|----------:|----------:|----------:|
| MultipleDirectoryCase | 11.40 s | 0.2248 s | 0.5473 s | 8000.0000 | 4000.0000 | 2000.0000 |  39.82 MB |

Slightly more memory usage due to the fact we are using a tree based system now for getting the nodes.

[glennawatson]

So some of the major changes,

When looking up dependent assemblies check the parent's directory first, check for windows runtime and get the appropriate folder in those cases, and only check out nuget repository store at the very end. This is more likely to get our correct match. This is much closer to what the mono loader does.