This commit replaces the current planet textures with upscaled originals. Therefore, the issues caused after adding the updated planet detailmaps are now fixed. However, there are still some minor issues and other inconsistencies with the new textures. Those will be fixed in future commits.
The planet detailmaps were previously compressed with the NVIDIA texture tools. However, the mipmaps weren't sharp, which caused the detailmaps to look a bit blurry at great distances. Therefore, Crunch was used to recompress the texture files with more a more accurate and sharper downscaling algorithm.
