gcs: build radio icon

Also make a bare vectorized icon SVG for use by anything else.  It
doesn't 100% pixel for pixel match the existing art, but the existing
art wasn't 100% consistent anyways.  (e.g. OSD was very different).

ground/gcs/src/plugins/config/configgadget.qrc

@@ -21,6 +21,8 @@
         <file>images/autotune_normal.png</file>
         <file>images/txpid_selected.png</file>
         <file>images/txpid_normal.png</file>
+        <file>images/radio_selected.png</file>
+        <file>images/radio_normal.png</file>
         <file>images/camstab_selected.png</file>
         <file>images/camstab_normal.png</file>
         <file>images/swap.svg</file>

ground/gcs/src/plugins/config/configgadgetwidget.cpp

@@ -199,8 +199,8 @@ void ConfigGadgetWidget::deferredLoader()
 
     case 12:
         icon = new QIcon();
-        icon->addFile(":/configgadget/images/osd_normal.png", QSize(), QIcon::Normal, QIcon::Off);
-        icon->addFile(":/configgadget/images/osd_selected.png", QSize(), QIcon::Selected,
+        icon->addFile(":/configgadget/images/radio_normal.png", QSize(), QIcon::Normal, QIcon::Off);
+        icon->addFile(":/configgadget/images/radio_selected.png", QSize(), QIcon::Selected,
                       QIcon::Off);
         qwd = new ConfigRadioWidget(this);
         ftw->insertTab(ConfigGadgetWidget::radio, qwd, *icon, QString("Radio"));

ground/gcs/src/plugins/config/images/ic_icons.md

@@ -3,3 +3,7 @@ These icons are made available under the GPL v3 compatible CC-BY 4.0. See https:
 
 ## License
 > We have made these icons available for you to incorporate them into your products under the [Creative Common Attribution 4.0 International License (CC-BY 4.0)](http://creativecommons.org/licenses/by/4.0/). Feel free to remix and re-share these icons and documentation in your products. We'd love attribution in your app's about screen, but it's not required. The only thing we ask is that you not re-sell the icons themselves.
+
+# Radio Icon
+
+Antenna by Icon Solid from the Noun Project (CC-BY)