Add initial support for remapping new API references (proof of concept)

[akbertram]

• Automatically Replaces classes and calls to specific static methods with calls to equivalent backported classes/methods

• Reads configuration from a mapping file, can be used with guava or stream support libraries, or custom implementations

More work needs to be done to arrive at a more comprehensive set of mappings, but I wanted to see to check with you first if there is interest in incorporating this into the retrolambda and if so, any feedback on the code.