Stenciled platform entities

[Jigoku]

Implement a way to use a stencil entity with platforms (would be placed as a resizeable rectangle).

• stencil area occludes portions of the drawn platform to create a hole
• would add some additional detail/interesting geometry to a level
• does not affect collisions, as this would be intentionally used on the inside bounds of a platform entity.

local function stencil()
    love.graphics.rectangle("fill", x,y, w, h, r, r)
end

love.graphics.stencil(stencil, "invert", 255)
love.graphics.setStencilTest("less", 255)

draw()