#317.Remove of dismissed pointers added to uninstall, added method to get all pointers from class.
#317 Code formatting
#317.Anonymous function changed on private function, sql query removed from loop.
#317.Code formatting.
#317.Callback function should be static.
#317 Use $wpdb->postmeta and $wpdb->usermeta
#317.Apllied more clear solution for get_all_pointers method.
Merge pull request #353 from laterpay/feature/317_remove_dismissed_pointers_on_uninstall

#317.Remove of dismissed pointers added to uninstall, added method to get all pointers from class.