[FL-3841] FuriEventLoop Pt.2 (#3703)

* Abstract primitive type from main logic in FuriEventLoop
* Remove message_queue_i.h
* Add stream buffer support for event loop
* Add semaphore support for event loop
* Add temporary unit test workaround
* Make the linter happy
* Add mutex support for event loop
* Implement event subscription and unsubscription while the event loop is running
* Implement edge events
* Fix leftover logical errors
* Add event loop timer example application
* Implement flag-based edge trigger and one-shot mode
* Add event loop mutex example application
* Only notify the event loop if stream buffer is at or above its trigger level
* Reformat comments
* Add event loop stream buffer example application
* Add event loop multiple elements example application
* Improve event loop flag names
* Remove redundant signal handler as it is already handled by the event loop
* Refactor Power service, improve ViewHolder
* Use ViewHolder instead of ViewDispatcher in About app
* Enable ViewDispatcher queue on construction, deprecate view_dispatcher_enable_queue()
* Remove all invocations of view_dispatcher_enable_queue()
* Remove app-scened-template
* Remove missing library from target.json
* Port Accessor app to ViewHolder
* Make the linter happy
* Add example_view_holder application, update ViewHolder docs
* Add example_view_dispatcher application, update ViewDispatcher docs
* Replace FuriSemaphore with FuriApiLock, remove workaround delay
* Fix logical error
* Fix another logical error
* Use the sources directive to speed up compilation
* Use constant define macro
* Improve FuriEventLoop documentation
* Improve FuriEventLoop documentation once more
* Bump API Version
* Gui: remove redundant checks from ViewDispatcher
* Gui: remove dead ifs from ViewDispatcher

Co-authored-by: Silent <CookiePLMonster@users.noreply.github.com>
Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: あく <alleteam@gmail.com>

lib/toolbox/api_lock.h

@@ -41,3 +41,7 @@ typedef FuriEventFlag* FuriApiLock;
 #define api_lock_wait_unlock_and_free(_lock) \
     api_lock_wait_unlock(_lock);             \
     api_lock_free(_lock);
+
+#define api_lock_is_locked(_lock) (!(furi_event_flag_get(_lock) & API_LOCK_EVENT))
+
+#define api_lock_relock(_lock) furi_event_flag_clear(_lock, API_LOCK_EVENT)