feat(dock): add custom icon selector for the dock launcher

Assets/Translations/en.json

@@ -1143,6 +1143,8 @@
       "appearance-launcher-position-start": "Start",
       "appearance-launcher-use-distro-logo-description": "Use your distribution logo as the dock launcher icon.",
       "appearance-launcher-use-distro-logo-label": "Use distro logo instead of icon",
+      "appearance-launcher-icon-description": "Choose the icon used for the dock launcher.",
+      "appearance-launcher-icon-label": "Launcher icon",
       "appearance-pinned-static-description": "Always push pinned app icons to the left in static order.",
       "appearance-pinned-static-label": "Static pinned apps",
       "appearance-position-description": "Choose where the dock appears on screen.",

Assets/settings-default.json

@@ -362,6 +362,7 @@
     "showLauncherIcon": false,
     "launcherPosition": "end",
     "launcherUseDistroLogo": false,
+    "launcherIcon": "",
     "launcherIconColor": "none",
     "pinnedStatic": false,
     "inactiveIndicators": false,