-Codechange: use safe string functions in script/squirrel*.cpp


git-svn-id: svn://svn.openttd.org@26776 6aa0318a-3be1-0310-93fa-89fd2396df07
-Codechange: use safe string functions in squirrel code as well, and prevent using the ones that are deemed unsafe


git-svn-id: svn://svn.openttd.org@26777 6aa0318a-3be1-0310-93fa-89fd2396df07
-Codechange: remove pointless rsl macro


git-svn-id: svn://svn.openttd.org@26778 6aa0318a-3be1-0310-93fa-89fd2396df07