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/lfrfid/view/elements/icon_element.cpp

@@ -0,0 +1,25 @@
+#include "icon_element.h"
+
+IconElement::IconElement() {
+}
+
+IconElement::~IconElement() {
+}
+
+void IconElement::draw(Canvas* canvas) {
+    if(icon != NULL) {
+        canvas_draw_icon(canvas, x, y, icon);
+    }
+}
+
+bool IconElement::input(InputEvent* event) {
+    return false;
+}
+
+void IconElement::set_icon(uint8_t _x, uint8_t _y, const Icon* _icon) {
+    lock_model();
+    icon = _icon;
+    x = _x;
+    y = _y;
+    unlock_model(true);
+}