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r7892 | pogokeen | 2019-08-07 09:19:03 -0700 (Wed, 07 Aug 2019) | 2 lines

tiles.cpp: backup & restore picsiz, walock, & waloff alongside other per tile arrays in artClearMapArt() and artSetupMapArt()
This fixes an issue with viewscreens as tiles that are setup game-side after a map is loaded could have their sizes reset to 0 while not being properly cleared from walock/waloff
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r7891 | pogokeen | 2019-08-07 09:19:00 -0700 (Wed, 07 Aug 2019) | 1 line

sector.cpp: ensure that if scripts have told us not to render normally to the tile, that we still handle restoring our target & setting up the tile appropriately for what the script may have rendered
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r7890 | pogokeen | 2019-08-07 09:18:57 -0700 (Wed, 07 Aug 2019) | 1 line

engine.cpp: make renderSetTarget() more robust so that passing an xsiz or ysiz <= 0 is not accepted and can't cause a segmentation fault
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