Fix object collision with solid noskew midtextures (resolves #523)

noskew middle textures were using the sector's heights at (X, Y) for collision instead of their regular heights.

added Bug Movement/physics labels

changed title from Fix #523 (closed) to Fix object collision with solid noskew midtextures (resolves #523 (closed))

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approved this merge request

added 116 commits

• b3418cd6...dbe3c0c7 - 115 commits from branch next
• 04bc7e1e - Merge branch 'next' into fix-523

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merged

mentioned in commit 0f479f60