cleanup

- fix possible crash in conc (but it's still an ugly hack)
- fix noob usage of strcmp
- flag some memory leaks (it would be nice, if the author(s) would clean
   up the mess himself)
- fix crash in substr
- whitespace cleanup

there are plenty more memory leaks in command.cpp - for example, every
goto in cubescript does not clean up anything

source/src/editing.cpp

@@ -403,9 +403,9 @@ void editdrag(bool isdown)
         lasty = cy;
         lasth = ch;
         tofronttex();
-        
+
         bool ctrlpressed = false;
-        
+
         if (identexists("newselkeys"))
         {
             extern vector<keym> keyms;