Changes

Fix value assignment with * indexer
Broken in #111 - probably an unusual case but it would have worked 
before.
Added tests to ensure that this fixes it.  Tests are not and will 
probably never cover all of MMPatchLoader.ModifyNode but useful to add 
bugfix cases here as they occur.
 (commit: c287441)

Reflection fields should be readonly
 (commit: 0aa64b5)

Create special GameData subdirectory
It's special
 (commit: ae2a14f)

Allow checking needs against directories
If the needs string contains a / it will check for a directory with that 
path in GameData.  Notes:
* PluginData folders are excluded
* Leading and trailing slashes are allowed
* Multiple slashes together will be treated as a single slash
* Comaprison is case sensitive
 (commit: 4a7e3c8)

Make patch stopwatch local
It's not needed outside of ProcessPatch(), which contains everything it 
needs to time
 (commit: 6c73797)

Make useCache local
Really only needed for a few lines in ProcessPatch()
 (commit: 267c64a)