patch changes & fixes from master branch

remove VERSION file
update rules
add 33 migration
add get_version_for_release.sh script
update schema
add use_character_sample_skills

system/migrations/33.php

@@ -0,0 +1,6 @@
+<?php
+// Increase size of ip in myaac_visitors table
+// according to this answer: https://stackoverflow.com/questions/166132/maximum-length-of-the-textual-representation-of-an-ipv6-address
+// the size of ipv6 can be maximal 45 chars
+
+$db->exec('ALTER TABLE `' . TABLE_PREFIX . "visitors` MODIFY `ip` VARCHAR(45) NOT NULL;");