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/application/file_path.cpp

@@ -57,3 +57,4 @@ const std::filesystem::path macaddress_dir = u"MACADDRESS";
 const std::filesystem::path splash_dot_bmp = u"/splash.bmp";
 const std::filesystem::path keeloq_keys_dir = u"KEELOQKEYS";
 const std::filesystem::path keeloq_remotes_dir = u"KEELOQREMOTES";
+const std::filesystem::path epirb_dir = u"EPIRB";