Investigate adding additional TypeConverter metadata to Resx

[JeremyKuhne]

Resx uses TypeConverters when available to convert data to/from string and byte[]. The specific type converter used isn't recorded, it's only the active one for typeof(T) that is considered. For unwrapping it would be good to know the specific type converter used and attempt to use the exact one if possible and give diagnostic information of some sort.

In order for this sort of change to have meaning, all copies of the Resx code need to be considered (MSBuild has their own, for example.)

cc @GrabYourPitchforks

[JeremyKuhne]

This is related to the BinaryFormatter in that if we maintained the converter information, we might be able to temporarily substitute in a converter that isn't applied via a hard coded attribute for a given type.

[JeremyKuhne]

@Shyam-Gupta this is the feature you're working on.

[AraHaan]

I feel like the designer should be updated to use alternatives as well so when people set localizable to true, they would not need to remake their resx files.