Build 3278
SVN-
General
Port system gamearray access from M32Script to CON. Expose tilesizx and tilesizy.
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Also, fix deficient logic in Gv_Free and Gv_Clear (both M32 and CON) so that gamevar and gamearray erasure results are (closer to) correct, and so that the game does not crash when system arrays are accessed from CON because they all have been nulled.