more cubescript limits

the limits are hardcoded and require recompilation to change

* limit recursion depth
* limit loop iterations
* limit string lengths
* limit push/pop depth
* clean surplus whitespace from config files
* provide context for script errors

(limits accidental crashes, not intentionally malfunctioning code)

source/src/zip.cpp

@@ -798,4 +798,3 @@ void listzipfiles(const char *dir, const char *ext, vector<char *> &files) // (d
     });
 }
 
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