Projection: implement reversed-Z and infinite zFar

Reversed-Z and infinite zFar are two techniques that improves depth precision, mitigating issues like Z-fighting. The implementation is described [here](http://dev.theomader.com/depth-precision/).

These approaches are gradually gaining popularity as default configuration in game engines. Especially, infinite zFar makes things simpler and should be the go-to configuration to be used.

Reversed-Z has a different Z representation: thus it's backward incompatible and needs a different API. Infinite zFar should be implemented as an addition to the API.