Add Security+ 2.0 TX App (#3217)

* Add U64 BoundSetting
* Add secplus-tx
* Add secplus license
* Update icon
* UI update
* Add filesystem::path BoundSetting
* Add file UI
* Rename file
* Add save button
* Fix warnings, add integer conversions to UI macros
* UI update
* Copilot suggestions, name edit UI
* Fix buffer length
* Style update
* Avoid recursion in Widget::style()
* Apply suggestions from code review
* Move secplustx.cpp to external
* Shorten title
* Space optimizations, remove FilePath setting
* Remove assertions
* Change namespace
* Change title to match

firmware/application/external/external.cmake

@@ -327,7 +327,7 @@ set(EXTCPPSRC
 	external/rtty_tx/ui_rtty_tx.cpp
 	external/rtty_tx/baudot.cpp
 
-    #pocsag_tx
+	#pocsag_tx
 	external/pocsag_tx/main.cpp
 	external/pocsag_tx/ui_pocsag_tx.cpp
 
@@ -362,6 +362,11 @@ set(EXTCPPSRC
 	#hard_reset
 	external/hard_reset/main.cpp
 	external/hard_reset/ui_hard_reset.cpp
+
+	#secplustx
+	external/secplustx/main.cpp
+	external/secplustx/ui_secplustx.cpp
+	external/secplustx/secplustx.cpp
 )
 
 set(EXTAPPLIST
@@ -451,6 +456,7 @@ set(EXTAPPLIST
 	two_tone_pager
 	two_tone_rx
 	hard_reset
+	secplustx
 )
 
 # sdusb has type conflicts with PRALINE (HackRF Pro) - add only for non-PRALINE builds