EPIRB TX Application (#3081)

* First step to epirb-tx app

* Next step to epirb_tx app

* Fixed merge

* EPIRB TX app progress

- Fixed UI
- Added automatic frame resend after delay
- Added load of beacons from EPIRB/BEACONS.TXT file

* First step to adding 121.5 MHz signal

* Refactored 121.5 signal generation code

* Added frequency change when switching from BPSK to AM

* Added checkbox for AM signal.

Added START/STOP button
Added AM frequency
First step to editor mode.

* Next step to frame editor

* Fixed location bits.

* Refactored code + fixed location

* Added location fields

* UI fixes + settings backup

Fixed lat/long display
Added send on change checkbox
Added settings backup
Fixed locator edition
Fixed BEACONS.TXT to move to Self test beacons.

* Update ui_epirb_tx.cpp

Fixed timeout reset

* Added national location protocol.

Added national location protocol.
Fixed send on change.

* UI fixes

Added country selection
Separated beacon protocol and beacon type selectors

* Standard protocol

Added standard protocol
Added internal checkbox

* Fixed fomratting

* Code cleanup

* Comments / doc

* More comments / doc

* More comments / doc

Fixed pre count duration.
Added frequency restore after leaving

* Prepare merge

* Prepare merge

* Finished merge

* More comments and doc

* Update ui_epirb_tx.cpp

Fixed out of memory error when using AlphanumView

* Update proc_epirb_tx.hpp

Fixed comment

* Fixed copilot PR comments.

* Update proc_epirb_tx.hpp

Fixed formatting

* Update external.ld

Merge with kiss_tnc app

firmware/common/message.hpp

@@ -156,6 +156,7 @@ class Message {
         RTTYData = 98,
         NotificationData = 99,
         TimeSinkConfig = 100,
+        EPIRBTXData = 101,
         MAX
     };
 
@@ -1110,6 +1111,19 @@ class SigGenToneMessage : public Message {
     const uint32_t tone_delta;
 };
 
+class EPIRBTXDataMessage : public Message {
+   public:
+    static constexpr uint8_t max_len = 18;
+    constexpr EPIRBTXDataMessage()
+        : Message{ID::EPIRBTXData} {
+    }
+    bool mode_bpsk = true;
+    uint8_t data[max_len]{0};
+    uint8_t data_len = 0;
+    uint32_t pre_count = 0;
+    uint32_t post_count = 0;
+};
+
 class AFSKTxConfigureMessage : public Message {
    public:
     constexpr AFSKTxConfigureMessage(