Fix pale Wi-Fi/Bluetooth tray icons, das-panel-icon help, publisher and deployer (0.9.5)

- Light theme uses Papirus-Light: the panel icons of Papirus are #dfdfdf,
  made for dark panels (xsettings, theme index, login screen).
- das-panel-icon help/-h/--help print usage instead of setting an icon;
  unknown options are rejected.
- New packages publisher (publish) and deployer (deploy) on the desktop
  image: config in ~/.config/<name>/ (neutral example copied on first run),
  history in ~/.local/state/<name>/.
- das-theme 0.3.0, das-settings 0.6.0.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

srcpkgs/das-settings/files/xfconf/xsettings.xml

@@ -3,7 +3,7 @@
 <channel name="xsettings" version="1.0">
   <property name="Net" type="empty">
     <property name="ThemeName" type="string" value="DasOS"/>
-    <property name="IconThemeName" type="string" value="Papirus"/>
+    <property name="IconThemeName" type="string" value="Papirus-Light"/>
   </property>
   <property name="Xft" type="empty">
     <property name="Antialias" type="int" value="1"/>