Curves

[jakubDoka]

This commit adds beizer curves to geometry and also adds one method for vector Angle to. Its all documentated. Curve should be used by a particle system i am planing to pull request.

[bcvery1]

Why no tests?

Not sure why you're returning a pointer for B, Linear or Constant and why you have a pointer receiver for Point, the rest of the file is entirely functional with no pointer returns or receivers

[jakubDoka]

Ok i ll make some test just for sake of it. Lets remove these pointers then.

[dusk125]

The Bezier functions/structures look good, was there a reason why you needed to change the pixelgl.Window structure to directly embed the glfh.Window structure?

[dusk125]

The Bezier functions/structures look good, was there a reason why you needed to change the pixelgl.Window structure to directly embed the glfh.Window structure?

@jakubDoka

[duysqubix]

@dusk125

I assume this PR is not relevant anymore.

[dusk125]

@duysqubix could still be useful, I would suggest we revert the window.go changes. But other than those, lgtm

[duysqubix]

@dusk125

I am going to recreate this PR in pixel2 to track and modify changes there.

Update:
PR merged with Pixel2