- add stencil buffer support for 2d drawing #1660
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This adds the ZScript methods
Screen.EnableStencil(bool on),Screen.SetStencil(int offs, int op, int flags = -1)andScreen.ClearStencil(), mimicking the internal drawing APIs.This allows for drawing commands to be clipped by significantly more complicated shapes than just axis-aligned rectangles, which is all the current clipping rectangle system can support. As such, this is sort of a companion PR to #1659, as it can be used along with that to create linearly transformed and clipped 2D elements, for example a rotated menu item (which is what my interest is with this).