Replace individual CMS vtx menus with a single entry that redirects to the correct protocol menu

Instead of having individual menus for RTC6705, SmartAudio, and Tramp, Now there is a single VTX menu that detects the type of active device and redirects to the appropriate protocol menu.

Reduces confusion and chances of erroneously using the wrong VTX menu.

Fixes a problem where the Tramp menu could be used to change band/channel/power even though the VTX was a SmartAudio device.

If the VTX is not configured or not communicating, a more informative message will be presented rather than a partially populated protocol menu. For example:
```
  VTX NOT RESPONDING
  OR NOT CONFIGURED

> BACK
```

Extends the CMS menu capabilities by adding an optional `redirectCheck` function that can conditionally return a menu that should be redirected to instead of the current menu. This redirect happens before any processing happens for the original menu. Adds flexibility to make the CMS menus have a more dynamic aspect.

src/main/cms/cms_menu_blackbox.c

@@ -221,6 +221,7 @@ CMS_Menu cmsx_menuBlackbox = {
 #endif
     .onEnter = cmsx_Blackbox_onEnter,
     .onExit = cmsx_Blackbox_onExit,
+    .checkRedirect = NULL,
     .entries = cmsx_menuBlackboxEntries
 };