Print messages when textures are detected as used in 3D/normal/roughness

This detection automatically changes some import options, so it's
important that users are aware of this.

editor/import/resource_importer_texture.cpp

@@ -104,24 +104,30 @@ void ResourceImporterTexture::update_imports() {
 			bool changed = false;
 
 			if (E.value.flags & MAKE_NORMAL_FLAG && int(cf->get_value("params", "compress/normal_map")) == 0) {
+				print_line(vformat("%s: Texture detected as used as a normal map in 3D. Enabling red-green texture compression to reduce memory usage (blue channel is discarded).", String(E.key)));
 				cf->set_value("params", "compress/normal_map", 1);
 				changed = true;
 			}
 
 			if (E.value.flags & MAKE_ROUGHNESS_FLAG && int(cf->get_value("params", "roughness/mode")) == 0) {
+				print_line(vformat("%s: Texture detected as used as a roughness map in 3D. Enabling roughness limiter based on the detected associated normal map at %s.", String(E.key), E.value.normal_path_for_roughness));
 				cf->set_value("params", "roughness/mode", E.value.channel_for_roughness + 2);
 				cf->set_value("params", "roughness/src_normal", E.value.normal_path_for_roughness);
 				changed = true;
 			}
 
 			if (E.value.flags & MAKE_3D_FLAG && bool(cf->get_value("params", "detect_3d/compress_to"))) {
-				int compress_to = cf->get_value("params", "detect_3d/compress_to");
+				const int compress_to = cf->get_value("params", "detect_3d/compress_to");
+				String compress_string;
 				cf->set_value("params", "detect_3d/compress_to", 0);
 				if (compress_to == 1) {
 					cf->set_value("params", "compress/mode", COMPRESS_VRAM_COMPRESSED);
+					compress_string = "VRAM Compressed (S3TC/ETC/BPTC)";
 				} else if (compress_to == 2) {
 					cf->set_value("params", "compress/mode", COMPRESS_BASIS_UNIVERSAL);
+					compress_string = "Basis Universal";
 				}
+				print_line(vformat("%s: Texture detected as used in 3D. Enabling mipmap generation and setting the texture compression mode to %s.", String(E.key), compress_string));
 				cf->set_value("params", "mipmaps/generate", true);
 				changed = true;
 			}