Storage: remove LFS (#3577)

* Storage: drop internal storage

* Storage: rollback some unnecessary changes

* Storage: rollback some unnecessary changes part 2

* Storage: cleanup various defines and int handling. Ble: allow short connection interval if internal flash is not used.

* Storage: do not return storage if it is not ready

* Save PIN code to RTC, update settings

* Simplify the code, clean up includes

* Rearrange some code

* apps: storage_move_to_sd: conditionally enable with --extra-define=STORAGE_INT_ON_LFS

* Load Desktop settings automatically

* Redirect /any to /ext

* Abolish storage_move_to_sd app

* Remove as many mentions of ANY_PATH as possible

* Fix desktop settings wrongly not loading

* Improve desktop settings handling and strings

* Load BLE settings and keys automatically

* Improve BLE configuration procedure

* Do not load bluetooth keys twice if they were already loaded

* Load dolphin state automatically

* Fix merge artifact

* Load notification settings automatically

* Update desktop settings strings

* Load expansion settings automatically

* Do not use thread signals to reload desktop settings

* Load region data automatically, separate to its own hook

* Improve ble behaviour with no keys

* Fix Dolphin state not resetting correctly

* Add a status check

* Make Desktop save its own settings

* Check result when taking and releasing mutex

* Improve default thread signal handling in FuriEventLoop

* Make bt service in charge of saving settings, add settings api

* Fix a deadlock due to timer thread not receiving time

* Lock core2 when reinitialising bt

* Update clang-format

* Revert "Update clang-format"

This reverts commit d61295ac063c6ec879375ceeab54d6ff2c90a9a1.

* Format sources with clang-format

* Revert old stack size for desktop settings

* Allocate big struct dynamically

* Simplify PIN comparison

* Save pointer to storage in Desktop object

* Fix region provisioning for hardware regions

* Remove stale TODO + siimplify code

* Clean up region.c

* Use sizeof instead of macro define

* Limit PIN length to 10 for consistency

* Emit a warning upon usage of /any

* Add delay after finding flipper

* Remove unnecessary delay

* Remove all mentions of STORAGE_INT_ON_LFS

* Remove littlefs and internal storage

* Remove all possible LittleFS mentions

* Fix browser tab in Archive

* Ble: fix connection interval explanation

* Bump API Symbols

* BLE: Update comments interval connection comments

* Storage: clear FuriHalRtcFlagStorageFormatInternal if set

---------

Co-authored-by: Georgii Surkov <georgii.surkov@outlook.com>
Co-authored-by: hedger <hedger@nanode.su>
Co-authored-by: Georgii Surkov <37121527+gsurkov@users.noreply.github.com>

furi/core/event_loop.c

@@ -107,10 +107,13 @@ void furi_event_loop_run(FuriEventLoop* instance) {
     furi_check(instance);
     furi_check(instance->thread_id == furi_thread_get_current_id());
 
-    furi_event_loop_init_tick(instance);
+    // Set the default signal callback if none was previously set
+    if(furi_thread_get_signal_callback(instance->thread_id) == NULL) {
+        furi_thread_set_signal_callback(
+            instance->thread_id, furi_event_loop_signal_callback, instance);
+    }
 
-    furi_thread_set_signal_callback(
-        instance->thread_id, furi_event_loop_signal_callback, instance);
+    furi_event_loop_init_tick(instance);
 
     while(true) {
         instance->state = FuriEventLoopStateIdle;
@@ -177,7 +180,10 @@ void furi_event_loop_run(FuriEventLoop* instance) {
         }
     }
 
-    furi_thread_set_signal_callback(instance->thread_id, NULL, NULL);
+    // Disable the default signal callback
+    if(furi_thread_get_signal_callback(instance->thread_id) == furi_event_loop_signal_callback) {
+        furi_thread_set_signal_callback(instance->thread_id, NULL, NULL);
+    }
 }
 
 void furi_event_loop_stop(FuriEventLoop* instance) {

furi/core/thread.c

@@ -318,6 +318,12 @@ void furi_thread_set_signal_callback(
     thread->signal_context = context;
 }
 
+FuriThreadSignalCallback furi_thread_get_signal_callback(const FuriThread* thread) {
+    furi_check(thread);
+
+    return thread->signal_callback;
+}
+
 bool furi_thread_signal(const FuriThread* thread, uint32_t signal, void* arg) {
     furi_check(thread);
 

furi/core/thread.h

@@ -270,7 +270,7 @@ FuriThreadState furi_thread_get_state(FuriThread* thread);
 /**
  * @brief Set a signal handler callback for a FuriThread instance.
  *
- * The thread MUST be stopped when calling this function.
+ * The thread MUST be stopped when calling this function if calling it from another thread.
  *
  * @param[in,out] thread pointer to the FuriThread instance to be modified
  * @param[in] callback pointer to a user-specified callback function
@@ -281,6 +281,14 @@ void furi_thread_set_signal_callback(
     FuriThreadSignalCallback callback,
     void* context);
 
+/**
+ * @brief Get a signal callback for a FuriThread instance.
+ *
+ * @param[in] thread pointer to the FuriThread instance to be queried
+ * @return pointer to the callback function or NULL if none has been set
+ */
+FuriThreadSignalCallback furi_thread_get_signal_callback(const FuriThread* thread);
+
 /**
  * @brief Send a signal to a FuriThread instance.
  *