ER Map Generator 1.2

-Added support for repacking map images with new or changed areas
-Added full stitching support for underworld and DLC map images
-New checkbox to toggle drawing debug info onto tiles while stitching map images
-Dropdowns for selecting ground level (M00, M01, M10) and zoom level (L0, L1, L2)
-Interactive map viewer lets you preview a stitched map image before repacking