* Applied suggestion in tid:76925. Added script command checkidle.
- Idle timer now resets when player sits/stands.
- Idle timer resets when sending a chat message (global, main, guild, party, or battleground).

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@17126 54d463be-8e91-2dee-dedb-b68131a5f0ec