Manual: Add missing plugins

The text is usually only a short description taken from the wiki and
don't contain screenshots or keymaps, but should be better than nothing. :)

Added manual entries:
- Boomshine
- Dict
- FFT
- main_menu_config
- Matrix
- Maze (including keymap)
- PDbox
- Superdom
Additional changes/fixes:
- fix "Clix" alphabetical order
- add Frotz & ZXBox to games preamble

Change-Id: I169870420cbac8123695747ccfcbaaf3478c11cc

manual/advanced_topics/main.tex

@@ -32,8 +32,9 @@ for changing the settings (the latter will be added automatically).
 To reset the menu items to the default, use \config{root~menu~order:-} (i.e.
 use a hyphen instead of ``items'').
 
-This configuration entry can only be created and edited with a text editor. It is
-not possible to change this setting via the settings menu.
+This configuration entry can only be created and edited with a text editor or
+the Main Menu Config Plugin (see \reference{ref:main_menu_config}).
+It is not possible to change this setting via the settings menu.
 
 \opt{lcd_bitmap}{
 \subsection{\label{ref:GettingExtras}Getting Extras}