feat: add menu module

Adds a new Menu module which allows users to create XDG or custom menus that open after clicking on a button.

Resolves #534

Co-authored-by: Jake Stanger <mail@jstanger.dev>

examples/menu/default.yml

@@ -0,0 +1,68 @@
+start:
+  - type: menu
+    center:
+      - type: xdg_entry
+        label: Accessories
+        icon: accessories
+        categories:
+          - Accessibility
+          - Core
+          - Legacy
+          - Utility
+      - type: xdg_entry
+        label: Development
+        icon: applications-development
+        categories:
+          - Development
+      - type: xdg_entry
+        label: Education
+        icon: applications-education
+        categories:
+          - Education
+      - type: xdg_entry
+        label: Games
+        icon: applications-games
+        categories:
+          - Games
+      - type: xdg_entry
+        label: Graphics
+        icon: applications-graphics
+        categories:
+          - Graphics
+      - type: xdg_entry
+        label: Multimedia
+        icon: applications-multimedia
+        categories:
+          - Audio
+          - Video
+          - AudioVideo
+      - type: xdg_entry
+        label: Network
+        icon: applications-internet
+        categories:
+          - Network
+      - type: xdg_entry
+        label: Office
+        icon: applications-office
+        categories:
+          - Office
+      - type: xdg_entry
+        label: Science
+        icon: applications-science
+        categories:
+          - Science
+      - type: xdg_entry
+        label: System
+        icon: applications-system
+        categories:
+          - Emulator
+          - System
+      - type: xdg_other
+      - type: xdg_entry
+        label: Settings
+        icon: preferences-system
+        categories:
+          - Settings
+          - Screensaver
+
+