WeFax rx ext app (#2566)

* wf3

* Ookbrute (#2354)

* Revert "Ookbrute (#2354)"

This reverts commit abb8143eec.

* fix

* test edition

* re enable ble

* re enable ert

* steal amfm stuff

* something happens

* save bmp on start btn

* kinda works

* exit crash fixed

* redline, remove some hardcoded

* removed cpu killer red line, and some fixes

* simplify #1

* seems ok. time to improve

* added hidden freq offset to receiver model, so wefax can be set to the "correct" freq without users needs to substract 300 hz

* badly implemented sync detection, and disabled it.

* fix for fix

* fixes

* fix offset to real life off

* no line on freq enter

* fixes

firmware/application/receiver_model.hpp

@@ -110,6 +110,8 @@ class ReceiverModel {
     uint8_t normalized_headphone_volume() const;
     void set_normalized_headphone_volume(uint8_t v);
 
+    void set_hidden_offset(rf::Frequency offset) { hidden_offset = offset; }
+
     void enable();
     void disable();
 
@@ -133,6 +135,7 @@ class ReceiverModel {
    private:
     settings_t settings_{};
     bool enabled_ = false;
+    rf::Frequency hidden_offset = 0;  // when we need to hide the offset from user, we set this. like when WeFax needs -300Hz.
 
     int32_t tuning_offset();