Cleanup for coding style

Add strict mode to check_style_guide script

modules/spacecraftinstruments/util/targetdecoder.h

@@ -28,7 +28,7 @@
 #include <modules/spacecraftinstruments/util/decoder.h>
 
 namespace openspace {
-    
+
 class TargetDecoder : public Decoder {
 public:
     TargetDecoder(const ghoul::Dictionary& dictionary);
@@ -40,7 +40,7 @@ private:
     std::string _type;
     std::vector<std::string> _names;
 };
-    
+
 } // namespace openspace
 
 #endif // __OPENSPACE_MODULE_SPACECRAFTINSTRUMENTS___TARGETDECODER___H__