[FL-2514] Port iButton application to C (#1198)

* Initial C iButton app setup
* Add more scenes
* Add even more scenes
* Add even more scenes again
* More scenes...
* Add key info scene
* Add delete success scene
* Use scene state to store internal data
* Add parameter parsing
* Add emulate scene
* Add write scene
* Add write success scene
* Add Read scene
* Add read success scene
* Add exit confirm scene
* Add retry confirm scene
* Add CRC error scene
* Add not key scene
* Add read key menu scene
* Rename some scenes
* Refactor conditionals
* Remove unneeded custom events
* Remove the old iButton app
* Correct formatting
* Remove rogue comments and function prototypes
* iButton: cleanup merge artifacts and fix warnings

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/ibutton/ibutton_custom_event.h

@@ -0,0 +1,12 @@
+#pragma once
+
+enum iButtonCustomEvent {
+    // Reserve first 100 events for button types and indexes, starting from 0
+    iButtonCustomEventReserved = 100,
+
+    iButtonCustomEventBack,
+    iButtonCustomEventTextEditResult,
+    iButtonCustomEventByteEditResult,
+    iButtonCustomEventWorkerEmulated,
+    iButtonCustomEventWorkerRead,
+};