get_tile
From ArchaicPixels: HuC and PCEAS Documentation
get_tile(char x, char y); [ 1.5 - 3.11, RENAMED IN 3.20 ]
Return the tile index as defined in the tile array used in the most
recent call to set_tile_data(). The 'x/y' argument is in pixel
units, unlike the put_tile functions and thus this function is ideal
for colision routines.
