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/ui/ui_freq_field.hpp

@@ -53,13 +53,21 @@ class BoundFrequencyField : public FrequencyField {
         };
 
         on_edit = [this, &nav]() {
+            if (on_edit_shown)
+                on_edit_shown();
             auto freq_view = nav.push<FrequencyKeypadView>(model->target_frequency());
             freq_view->on_changed = [this](rf::Frequency f) {
                 set_value(f);
             };
+            nav.set_on_pop([this]() {
+                if (on_edit_hidden)
+                    on_edit_hidden();
+            });
         };
     }
 
+    std::function<void(void)> on_edit_shown{};   // fired, when the FrequencyKeypadView pops up
+    std::function<void(void)> on_edit_hidden{};  // fired, when the FrequencyKeypadView ended
     // TODO: override set_step and update the rx model then call base.
 };