* can be used to install plugins from command line. Usage: "php install_plugin.php path_to_file"
* fixed if HTTP_HOST not set in common.php when executed from command line
* Added 'Are you sure?' popup when uninstalling plugin
* Moved plugin install logic to a new class: Plugins
* added some warnings when plugin json file is incomplete
* added option to uninstall plugin
* added option to require specified myaac or php version for plugins
* added links loaded from database to admin panel - for future plugins
* added few characters hooks
* fixed some kathrine template js bug when shop is disabled