Added support to StrokedRoundedRectView for individual corner control

[adielfernandez]

Needed it for WetlandData so I added some ci::Anim's and tweaked the shader to allow for changing the radii of individual corners. See ViewTypesSample app for use case. The conditional in the shader isn't ideal, of course, but I can't imagine any perceivable slowdowns.

Feel free to make changes to for styling consistency/preference. Probably should have changed useUniformCorners(bool use) to setUniformCorners(bool use)

[benjaminbojko]

Awesome! Thanks for putting this together. Instead of toggling with the boolean, can we just use 4 radii by default?

We could have a few versions of setCornerRadius():

setCornerRadius(float radius); // sets all radii
setCornerRadius(float top, float right, float bottom, float left); // individual

Then the shader can lose one if/else and we can be a bit more clear about what's happening. The only thing I get that's complicated then is animating the radius globally... Is that why you had it broken out like that?

[adielfernandez]

Yeah, that makes sense! Will add it in shortly.