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r7473 | pogokeen | 2019-04-05 10:45:22 -0700 (Fri, 05 Apr 2019) | 1 line

Fix issue where swingdoors would refuse to open or close if an enemy was in front of the door in an overlapping but unrelated/disjoint sector
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r7472 | pogokeen | 2019-04-05 10:45:19 -0700 (Fri, 05 Apr 2019) | 1 line

engine.cpp: lintersect(): fix integer overflow and negative case issue
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r7471 | pogokeen | 2019-04-05 10:45:16 -0700 (Fri, 05 Apr 2019) | 4 lines

Re-introduce earlier lintersect() work that was reverted.
engine.cpp/.h: clean up & fix lintersect().  Additionally, add support for finding intersections of collinear line segments.

This reverts r7290.
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