Migrating Class to Nested Fully Qualified Class

[gabizou]

In the commit for SpongeCommon, there's a migration of ImmutableValue -> Value.Immutable, but it appears that instead of importing the outer class, it will fully qualify the class in usage, resulting in long lines.

[jamierocks]

It seems likely that this is due to inner classes having the wrong inner class notation.

Our tools can't disern between com.Outer.Inner and com.Outer$Inner essentially, so input data must use the $ delimeter.