Updates to MacPListBrowser

Added StringValue property.
Fixed problem preventing compile in RS 2012r2.1
Merge pull request #20 from ktekinay/master

Updated MacPListBrowser, fixed compile problem in RS 2012r2.1
Rename ValuesAsArrayOfStrings to StringValues; this method now raises a TypeMismatchException when some array element does not inherit from NSString instead of skipping; fix several occurrences of a bug in NSFontManager in which NSArray.VariantValue was being returned instead of a String array.
Remove commented-out code.
Clean up code here and there.
Merge pull request #21 from declaresub/master

Fix issues in NSFontManager.
Merge pull request #11 from macoslib/master

Sync changes.