Graphics Updates / Fixes (see notes)

* Made default circle and curve resolutions match across `ofStyle` and `ofPath`.
* Deprecated `arcResolution` in favor of `circleResolution`.
* Require polyline curves in `ofPath` to respect the `ofPath`'s `curveResolution` and `circleResolution`.
* Require global curve functions such as `ofCurve` to respect current `ofStyle`s `curveResolution`.
* Updated `ofRectRounded`
  * Added support for multiple corner radii.
  * Use arcs rather than bezier curves.
  * Respect z.
  * Respect circleResolution.
* Updated `ofPolyline` get bounding box to use `ofRectangle`'s new `growToInclude` method.
* Added const correctness in several places.