Feature: ofCamera should be used for internal of view

I thought I had posted this already.
It would be great if we could have ofCamera do the camera setup in a default OF app.

Right now the code is duplicated.

Also it could allow the user could do something like:

ofCameraRef cam = ofGetCameraRef();
ref.dolly(-200, 0);

It would also allow for swapping out the current view with a different one.

ofSetCamera( newCam );

or

ofSetCamera( newEasyCam );

This is actually not really the api I'm proposing.
Just the overall change I think should be made.

Relates issues:
#410
#765

One other thing that is more of a bigger question is can we make OF more object orientated?

ie instead of:
ofSetCamera( ofCamera cam );

ofGetWindow(0).getContext().setCamera( cam );

Anyway I think that is for a separate GH issue - but I mention it as OF's global methods list is growing quite quickly and it might be time again to look at namespaces or moving some of the things in a more object orientated direction.

Start by reviewing how the default OF app currently sets up its camera and the related issues #410 and #765. Clarify the intended camera ownership, replacement API, and object-oriented scope before implementation; done should include an agreed design for internal camera setup and user camera swapping.