Improved Adminmenu

The logical structure of the Admin menu, as it is currently at CMSimple_XH 1.5.3, I do not like. In the first level, there are menu items:

We have become accustomed to, but meaningful it is not.

Using the Pluginmanager now the menu item of the 1st Level called "Plugins" also is clickable, it will open the Pluginmanager.

In the new Admin menu now also the option "Files" is clickable, it opens the filemanager and opens the folder "user files" directly. Now all menu items of the first level are clickable in the admin menu.

There was another problem: The Plugins menu was too long, if many plugins was installed. Now there is a "3 columns Plugins menu", if there are a defined number of plugins are installed.

From how many plugins the "3 columns Plugins menu" is active, is configurable.

Moreover, you can remove rarely used plugins from the Plugins menu (via Pluginmanager), so the plugins menu is more clear.