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-template/app_template.cpp

@@ -1,4 +1,4 @@
-#include "app-template.h"
+#include "app_template.h"
 
 /*
 To use this example you need to rename
@@ -64,12 +64,14 @@ uint8_t AppExample::run() {
         if(get_event(&event, 1000)) {
             if(event.type == AppExampleEvent::EventTypeKey) {
                 // press events
-                if(event.value.input.type == InputTypeShort && event.value.input.key == InputKeyBack) {
+                if(event.value.input.type == InputTypeShort &&
+                   event.value.input.key == InputKeyBack) {
                     printf("bye!\n");
                     return exit();
                 }
 
-                if(event.value.input.type == InputTypeShort && event.value.input.key == InputKeyUp) {
+                if(event.value.input.type == InputTypeShort &&
+                   event.value.input.key == InputKeyUp) {
                     // to read or write state you need to execute
                     // acquire modify release state
                     acquire_state();

lib/app-template/app_template.h

@@ -2,7 +2,7 @@
 
 #include "callback-connector.h"
 #include <furi.h>
-#include <furi-hal.h>
+#include <furi_hal.h>
 #include <gui/gui.h>
 #include <input/input.h>