Create Search_Keys.php

This code will create a SQL search string based on a passed string. The string will use the following rules:
-The first word found will be used in searching for a key name.
-The first word can be omitted to search for all keys.
-The parameter &area will add a filter to search for whatever word follows.
-The parameter &level will add a filter to search for Key_Level.

Example:  'Blue &area BEER'
Will search for all keys containing the word 'Blue' in area BEER.