New LF-RFID app (#534)

* Hal lfrfid: add read timer pulse and period config fns
* New debug application for lfrfid subsystem
* New lfrfid: app, fix naming
* App lfrfid: assets
* Container view module
* App ibutton: remove unused header
* App lfrfid scenes
* App notification, add yield to blocking operations, add speaker volume control
* App lfrfid: reading key scene
* Assets: placeholder icon
* App lfrfid: reworked container view module
* App lfrfid: new scenes
* App lfrfid: write scene
* App lfrfid: write hid
* App lfrfid: emulate scene
* App lfrfid: save name scene
* App lfrfid: add missing file

applications/lfrfid/helpers/manchester-decoder.h

@@ -0,0 +1,31 @@
+#pragma once
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    ManchesterEventShortLow = 0,
+    ManchesterEventShortHigh = 2,
+    ManchesterEventLongLow = 4,
+    ManchesterEventLongHigh = 6,
+    ManchesterEventReset = 8
+} ManchesterEvent;
+
+typedef enum {
+    ManchesterStateStart1 = 0,
+    ManchesterStateMid1 = 1,
+    ManchesterStateMid0 = 2,
+    ManchesterStateStart0 = 3
+} ManchesterState;
+
+bool manchester_advance(
+    ManchesterState state,
+    ManchesterEvent event,
+    ManchesterState* next_state,
+    bool* data);
+
+#ifdef __cplusplus
+}
+#endif