[Swift] Fix escaping of parameter and class names

[designatednerd]

This fix addresses iOS 193, where the name of the parameter was being escaped in a property, but the name of the type was not.

Also made sure the names of classes are being properly escaped, and the names of parameters on protocol property declarations.

Note: I've left the type unescaped on protocol properties purposely, because I'm not sure if we're using Self as a bound anywhere, and I'd like to fix the other stuff without breaking the crap out of that.

[designatednerd]

Also threw in a couple tests so we can better check regressions on #1441. Merging.