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

lib/app-scened-template/view_modules/submenu_vm.cpp

@@ -0,0 +1,33 @@
+#include "submenu_vm.h"
+
+SubmenuVM::SubmenuVM() {
+    submenu = submenu_alloc();
+}
+
+SubmenuVM::~SubmenuVM() {
+    submenu_free(submenu);
+}
+
+View* SubmenuVM::get_view() {
+    return submenu_get_view(submenu);
+}
+
+void SubmenuVM::clean() {
+    submenu_clean(submenu);
+}
+
+void SubmenuVM::add_item(
+    const char* label,
+    uint32_t index,
+    SubmenuItemCallback callback,
+    void* callback_context) {
+    submenu_add_item(submenu, label, index, callback, callback_context);
+}
+
+void SubmenuVM::set_selected_item(uint32_t index) {
+    submenu_set_selected_item(submenu, index);
+}
+
+void SubmenuVM::set_header(const char* header) {
+    submenu_set_header(submenu, header);
+}