Modified how plugin metadata is fetched.
Removed ability for the user to choose which fields to fetch.
All fields are fetched now.
Added a [metadata] tag that would allow for faster lookups.
Keys to check are between square brackets rather than plain long text.
Calls to strlen() are replaced by isset().
Future needed keys can be dynamically added by just modifying the plugin comments.
Updated all plugins and themes to match this new behaviour.