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/ibutton/ibutton_event.h

@@ -0,0 +1,30 @@
+#pragma once
+#include <stdint.h>
+#include <gui/modules/dialog_ex.h>
+#include <gui/modules/widget.h>
+
+class iButtonApp;
+
+class iButtonEvent {
+public:
+    // events enum
+    enum class Type : uint8_t {
+        EventTypeTick,
+        EventTypeBack,
+        EventTypeMenuSelected,
+        EventTypeDialogResult,
+        EventTypeTextEditResult,
+        EventTypeByteEditResult,
+        EventTypeWidgetButtonResult,
+    };
+
+    // payload
+    union {
+        uint32_t menu_index;
+        DialogExResult dialog_result;
+        GuiButtonType widget_button_result;
+    } payload;
+
+    // event type
+    Type type;
+};