[FL-1720] BLE GUI refactoring (#678)

* dialog_ex: add clean method, fix documentation
* application: add bt debug and settings application
* bt: add debug application
* bt: add settings application
* bt: rework bt service
* bt debug: fix carrier debug app
* assets: add debug animation to main menu
* bt debug: fix bt packet test
* bt service: rework bt service
* bt: cleanup
* Assets: fix spelling
* Ble: wait for core 2 startup complete before initializing radio stack.
* Accessor: remove dead code, switch port PA6 to PA4, because interrupt line 6 is used by down button.
* FuriHal: assert interrupt line on add_int_callback.
* Bt: update icon on core2 startup complete.

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

firmware/targets/f6/furi-hal/furi-hal-bt.c

@@ -43,7 +43,7 @@ bool furi_hal_bt_is_alive() {
     return APPE_Status() == BleGlueStatusStarted;
 }
 
-bool furi_hal_bt_wait_transition() {
+bool furi_hal_bt_wait_startup() {
     uint8_t counter = 0;
     while (APPE_Status() == BleGlueStatusStartup) {
         osDelay(10);
@@ -56,7 +56,7 @@ bool furi_hal_bt_wait_transition() {
 }
 
 bool furi_hal_bt_lock_flash() {
-    if (!furi_hal_bt_wait_transition()) {
+    if (!furi_hal_bt_wait_startup()) {
         return false;
     }
     if (APPE_Status() == BleGlueStatusUninitialized) {
@@ -100,7 +100,7 @@ void furi_hal_bt_start_packet_rx(uint8_t channel, uint8_t datarate) {
 }
 
 uint16_t furi_hal_bt_stop_packet_test() {
-    uint16_t num_of_packets;
+    uint16_t num_of_packets = 0;
     hci_le_test_end(&num_of_packets);
     return num_of_packets;
 }

firmware/targets/f6/furi-hal/furi-hal-gpio.c

@@ -151,6 +151,7 @@ void hal_gpio_add_int_callback(const GpioPin* gpio, GpioExtiCallback cb, void* c
 
     __disable_irq();
     uint8_t pin_num = hal_gpio_get_pin_num(gpio);
+    furi_assert(gpio_interrupt[pin_num].callback == NULL);
     gpio_interrupt[pin_num].callback = cb;
     gpio_interrupt[pin_num].context = ctx;
     gpio_interrupt[pin_num].ready = true;

firmware/targets/furi-hal-include/furi-hal-bt.h

@@ -19,6 +19,9 @@ void furi_hal_bt_dump_state(string_t buffer);
 /** Get BT/BLE system component state */
 bool furi_hal_bt_is_alive();
 
+/** Wait for Core2 startup */
+bool furi_hal_bt_wait_startup();
+
 /**
  * Lock shared access to flash controller
  * @return true if lock was successful, false if not