feat: add borders

[WillPower3309]

TODO:

• [x] border setting
• [x] add border width to corner radius
• [x] border stencil
• [x] proper damage tracking
• [ ] support scaled and rotated outputs
• [ ] decrease buffer size by border size (otherwise the borders can mess up gaps because they increase the visual size of the surface)
• [x] remove slight rounding with corner radius of 0