Naming and coding style convention, new linter tool. (#945)

* Makefile, Scripts: new linter
* About: remove ID from IC
* Firmware: remove double define for DIVC/DIVR
* Scripts: check folder names too. Docker: replace syntax check with make lint.
* Reformat Sources and Migrate to new file naming convention
* Docker: symlink clang-format-12 to clang-format
* Add coding style guide

applications/accessor/accessor_view_manager.h

@@ -0,0 +1,39 @@
+#pragma once
+#include <furi.h>
+#include <gui/view_dispatcher.h>
+#include <gui/modules/submenu.h>
+#include <gui/modules/popup.h>
+#include "accessor_event.h"
+
+class AccessorAppViewManager {
+public:
+    enum class ViewType : uint8_t {
+        Submenu,
+        Popup,
+        Tune,
+    };
+
+    osMessageQueueId_t event_queue;
+
+    AccessorAppViewManager();
+    ~AccessorAppViewManager();
+
+    void switch_to(ViewType type);
+
+    void receive_event(AccessorEvent* event);
+    void send_event(AccessorEvent* event);
+
+    Submenu* get_submenu();
+    Popup* get_popup();
+
+private:
+    ViewDispatcher* view_dispatcher;
+    Gui* gui;
+
+    uint32_t previous_view_callback(void* context);
+    void add_view(ViewType view_type, View* view);
+
+    // view elements
+    Submenu* submenu;
+    Popup* popup;
+};