Updated Esenthel Source:
-reduced stack memory usage for World Editor heightmap building (to fix crashes on Linux)
-replaced ThreadMayUseGPUData / ThreadFinishedUsingGPUData with a helper class GPUDataUse for auto lock and release

Updated Esenthel Source:
-updated Behind shader to calculate effect angle based on eye/ray direction
-added a lot more translation functions
-List elements now support description based on StrEx
-added List.image_filter