Fixed Bug #7525

Item name constants conflicting with script var names will now result in a map server warning/notice and in the background map server will prioritise the script variable over the item name constant.
http://hercules.ws/board/tracker/issue-7525-set-variable-is-not-recognized-causing-freezing/
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Also followup 586c0f7983f81e97ca70c57712e25d4d51453d6b sc_config.txt update

Signed-off-by: shennetsind <ind@henn.et>