Low frequency RFID app [Read stage] (#385)

* App Lfrfid: init
* HAL-resources: add external gpios
* HAL-pwm: fix frequency calculation
* App LFRFID: generic manchester decoder
* App LFRFID: em-marine decoder
* App iButton: fix dwt timing acquire
* App LFRFID: rfid reader
* App LFRFID: temporary read keys on read scene
* App LFRFID: remove atomic bool init.
* App LFRFID: add *.c to build
* App LFRFID: unstable HID decoder
* App LFRFID: HID-26 reading
* HAL OS: disable sleep
* App LFRFID: HID-26 reader: remove debug
* App LFRFID: static data decoder-analyzer
* App LFRFID: very raw Indala decoder
* App LFRFID: multiprotocol reader
* App LFRFID: more reliable HID decoder
* App LFRFID: syntax fix
* App LFRFID: simple read scene
* Gui: force redraw on screen stream connect
* HAL-OS: allow sleep
* App LFRFID: notify api, tune view, tune scene
* App LFRFID: simple rfid emulator
* App LFRFID: more scenes, more reliable EM decoder.
* App LFRFID: format fix
* App LFRFID: warning fix
* Api-hal-resources: add rfid pins, rename external pins
* App LFRFID: remove unused emulator
* App LFRFID: use new gpio hal api
* App accessor: use new ext gpio name
* App LFRFID: remove unused emulator
* App LFRFID: remove debug gpio
* Api-hal-resources: alternate functions init
* Api-hal-rfid: new api
* Api-hal-ibutton: new api
* Api-hal: new headers
* App LFRFID: use new api in reader subroutines
* App LFRFID: use new api in emulator subroutines
* App LFRFID: remove old app
* App LFRFID, App iButton: fix memleak
* Api-hal-rfid: comments
* App LFRFID: pulse joiner helper, it combines pulses of different polarity into one pulse suitable for a timer
* App LFRFID: pulse joiner, now can accept only ne pulse
* App LFRFID: pulse joiner, fixes
* App LFRFID: EM encoder and emulation
* App LFRFID: format fixes
* App LFRFID: emmarine encoder cleanup
* App LFRFID: HID Encoder blank
* App LFRFID: Indala Encoder blank

applications/lf-rfid/helpers/rfid-timer-emulator.h

@@ -0,0 +1,36 @@
+#pragma once
+#include <api-hal.h>
+#include "key-info.h"
+#include "encoder-generic.h"
+#include "encoder-emmarine.h"
+#include "encoder-hid.h"
+#include "encoder-indala.h"
+#include "pulse-joiner.h"
+#include <map>
+
+class RfidTimerEmulator {
+public:
+    enum class Type : uint8_t {
+        EM,
+        HID,
+        Indala,
+    };
+
+    RfidTimerEmulator();
+    ~RfidTimerEmulator();
+    void start(Type type);
+    void stop();
+    void emulate();
+
+private:
+    EncoderGeneric* current_encoder = nullptr;
+
+    std::map<Type, EncoderGeneric*> encoders = {
+        {Type::EM, new EncoderEM()},
+        {Type::HID, new EncoderHID()},
+        {Type::Indala, new EncoderIndala()},
+    };
+
+    PulseJoiner pulse_joiner;
+    static void timer_update_callback(void* _hw, void* ctx);
+};