Coalesce some allocations (#3747)

* View: Coalesce view model allocations
* SceneManager: Coalesce AppScene allocations
* BufferStream: Coalesce Buffer allocations
* ProtocolDict: Coalesce dict allocations
* DigitalSignal: Coalesce buffer allocations

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

applications/services/gui/scene_manager_i.h

@@ -17,6 +17,6 @@ typedef struct {
 struct SceneManager {
     SceneManagerIdStack_t scene_id_stack;
     const SceneManagerHandlers* scene_handlers;
-    AppScene* scene;
     void* context;
+    AppScene scene[];
 };