Fixed a bunch of clang warnings

1. Fix misleading indentation warnings.
2. Fix creating a temporary const copy when iterating over a map (thanks to range analysis warnings)
3. Fix creating a copy when iterating over a range without reference qualifier (also thanks to range analysis warnings)

code/MDL/MDLLoader.cpp

@@ -1421,7 +1421,7 @@ void MDLImporter::InternReadFile_3DGS_MDL7( )
         avOutList[i].reserve(3);
 
     // buffer to held the names of all groups in the file
-	const size_t buffersize( AI_MDL7_MAX_GROUPNAMESIZE*pcHeader->groups_num );
+    const size_t buffersize(AI_MDL7_MAX_GROUPNAMESIZE*pcHeader->groups_num);
 	char* aszGroupNameBuffer = new char[ buffersize ];
 
     // read all groups