Adds the ability to sort and group the Effects menus

Current options:

Publisher: name (the closest to what we have now)
Name (doesn't include the publisher, just a straigt up alpha sort
Publisher (creates submenus based on the publisher)
Type (creates submenus based on the type, VST, Nyquist, etc.)

And the Linux method of creating submenus based on number of items
is available to all and you can choose how menu you want per submenu.
I had to bring this back since I'd removed it when for the new effects
and I figured why limit it to only Linux...

Check it out in Preferences (effect page).

You'll also notice that the effects page is starting to talk about 
plugins.  That will progress further (baby steps) so bare with me
for just a bit more.

src/Project.h

@@ -54,6 +54,7 @@ class ODLock;
 class RecordingRecoveryHandler;
 class TrackList;
 class Tags;
+class EffectPlugs;
 
 class TrackPanel;
 class FreqWindow;