Mask collision detection #372
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Adds `actor1.collidemask(actor2)` as a function to check pixel perfect collisions. The function first checks for collision via `.colliderect()` and masks are only created for actors when necessary, meaning there is no performance cost if the function isn't used in a project. Adds documentation and tests. The documentation makes it clear that this function has a bigger impact on performance than `.colliderect()` and should only be used sparingly.
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Adds pixel perfect collision detection with masks between two actors as a new function:
actor1.collidemask(actor2)Masks are only created when necessary and the collision check ends early if the rects of the actors don't intersect.
The documentation makes it very clear that this kind of collision check is a lot more expensive than
.colliderect()and discourages general usage unless necessary.Unittests are written.