[FL-3953] Application chaining (#4105)

* feat: app chaining

* add `launch_current_app_after_deferred`, remove `get_referring_application`

* fix naming

* new api

* fix f18

* fix deferred launches after errors

* fix: memory leak

* Updater: MIN_GAP_PAGES = 0

* loader: loader_get_application_launch_path doc

* loader: fix freeze

* loader: reject mlib, reduce code size

* loader: generic synchronous call, reduce size

* loader: reject furi_string, reduce size

* apps: debug: removed order field from manifests since it is no longer meaningful

---------

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
Co-authored-by: hedger <hedger@nanode.su>

applications/services/loader/loader_queue.h

@@ -0,0 +1,53 @@
+#pragma once
+
+#include <furi.h>
+
+#include "loader.h"
+
+#define LOADER_QUEUE_MAX_SIZE 4
+
+typedef struct {
+    char* name_or_path;
+    char* args;
+    LoaderDeferredLaunchFlag flags;
+} LoaderDeferredLaunchRecord;
+
+typedef struct {
+    LoaderDeferredLaunchRecord items[LOADER_QUEUE_MAX_SIZE];
+    size_t item_cnt;
+} LoaderLaunchQueue;
+
+/**
+ * @brief Frees internal data in a `DeferredLaunchRecord`
+ * 
+ * @param[out] item Record to clear
+ */
+void loader_queue_item_clear(LoaderDeferredLaunchRecord* item);
+
+/**
+ * @brief Fetches the next item from the launch queue
+ * 
+ * @param[inout] queue Queue instance
+ * @param[out]   item  Item output
+ * 
+ * @return `true` if `item` was populated, `false` if queue is empty
+ */
+bool loader_queue_pop(LoaderLaunchQueue* queue, LoaderDeferredLaunchRecord* item);
+
+/**
+ * @brief Puts an item into the launch queue
+ * 
+ * @param[inout] queue Queue instance
+ * @param[in]    item  Item to put in the queue
+ * 
+ * @return `true` if the item was put into the queue, `false` if there's no more
+ * space left
+ */
+bool loader_queue_push(LoaderLaunchQueue* queue, LoaderDeferredLaunchRecord* item);
+
+/**
+ * @brief Clears the launch queue
+ * 
+ * @param[inout] queue Queue instance
+ */
+void loader_queue_clear(LoaderLaunchQueue* queue);