Bugfixes for the Pincode system.

Features:
- Pincode Force Mode(users need to use a PIN)
- Character switching without being asked for the PIN
- Pincode change time is now in days(yeah Ind, seconds were for testing purposes)

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@17192 54d463be-8e91-2dee-dedb-b68131a5f0ec