Add proper square intersection code

[Philip Taylor]

CCmpObstructionManager​ deals with line/circle/square intersections, for use with pathfinding and building placement etc. Currently squares aren't implemented at all (it pretends they're circles) - they should be added.

"Squares" are non-axis-aligned rectangles, so I think it's just some slightly ugly but straightforward geometry. Everything needs to be done with fixed-point maths (to get reliably repeatable results), so care needs to be taken with overflow, which makes it a bit trickier.

There ought to be some test cases for the code (see e.g. test_Position.h for the general framework for testing simulation components).

[Philip Taylor]

This is obsoleted and/or done by r7484.

[(none)]

Milestone Unclassified deleted