Add filters to transform data after validation

[SharkFourSix]

Feature Request

Q	A
New Feature	yes
RFC	yes/no
BC Break	yes/no

Summary

It would be nice to have support for filters alongside validators. Filters will allow transformation of the input values. For instance, instead of manually having to trim strings of space, a trim filter can be added to do that. Another case is when you'd want to convert a string's case and or trim off excess characters.

Can this be done?