Tilengine 2.11.3 bugfix released

This release fixes some bugs left in version 2.11, that introduced the ability to use up to 8 tilesets per tilemap and layer.

• Tiled import: having unused or unordered .tsx tilesets inside a .tmx tilemap is accepted and lo longer causes segfaults
• Palette raster effects calling TLN_SetLayerPalette() mid-frame were inadvertently broken. Fixed

Please update to this version if using the new multi-tileset feature, or using palette raster effects