Feature reuest: extend ofPolyline to scale, rotate and form bounding cubes

In brief: ofPolyline is both 3D and drawable, and should therefore have the traits associated with drawables and 3D objects.

It should have, ideally:

ofPolyline::scale(ofVec3f scaleAmount, ofPoint anchorPoint);
ofPolyline::scale(float scaleAmount, ofPoint anchorPoint);
//anchorPoint can be the center of the bounding box by default

ofPolyline::rotate(ofVec3f angle, ofVec3f axis);
//rotation systems are a matter of taste, there must be a general preference somewhere. I suggest Euler angles by default and an about axis which defaults to (0,0,1)

ofPolyline::getBoundingCube();
//right now getBoundingBox() returns an ofRectangle which isn't a box at all. ofPolylines are 3D

ofPolyline::applyMatrix(ofMatrix4x4 m);
//because some people are just like that, right?

Most of these changes are inspired by 2D masks in After Effects and 3D masks in Flame/Flint/Inferno.

On a side note: right now, ofPolyline::resize() calls vector<ofPoint>::resize() inside it. Polyline is drawable, so I think that's an unhealthy semantic overloading that can be avoided.

I found this issue while extending memo's ofxIldaPoly class, which extends ofPolyline, and as of now contain a lot of the necessary additions.

Start by reading the existing ofPolyline implementation, especially resize() and getBoundingBox(), then compare the related additions in the linked ofxIldaPoly class. Clarify the scale, rotation, bounding-cube, matrix, and resize semantics before implementing; done should provide consistent APIs for 3D drawable polylines.