Plugin Hooks, built with the system, have been modified to check if their respective plugin is actually loaded or not to perform actions.  This is needed, for now, because if  user installs the plugins, for the first time, and then logs out.  When they login again and try removing the plugin, it will remove successfully, but the hooks will remain active even after they've been removed/reinstalled until they logout and back in again.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@1979 71f96598-fa45-0410-b640-bcd6f8691b32
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