define_exception

Add exception handling information
     code - exception code
     name - exception name
     desc - exception description
     flags - exception flags (combination of EXC_...)
returns: failure description or ""

string define_exception(long code, string name, string desc, long flags);

#define EXC_BREAK  0x0001 // break on the exception
#define EXC_HANDLE 0x0002 // should be handled by the debugger?
#define EXC_MSG    0x0004 // instead of warn, log the exception to the output window
#define EXC_SILENT 0x0008 // do not warn or log to the output window