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/about/about.c

@@ -4,7 +4,7 @@
 #include <gui/view_dispatcher.h>
 #include <gui/modules/empty_screen.h>
 #include <m-string.h>
-#include <furi-hal-version.h>
+#include <furi_hal_version.h>
 
 typedef DialogMessageButton (*AboutDialogScreen)(DialogsApp* dialogs, DialogMessage* message);
 
@@ -14,7 +14,7 @@ static DialogMessageButton product_screen(DialogsApp* dialogs, DialogMessage* me
     const char* screen_header = "Product: Flipper Zero\n"
                                 "Model: FZ.1\n";
     const char* screen_text = "FCC ID: 2A2V6-FZ\n"
-                              "IC ID: 27624-FZ";
+                              "IC: 27624-FZ";
 
     dialog_message_set_header(message, screen_header, 0, 0, AlignLeft, AlignTop);
     dialog_message_set_text(message, screen_text, 0, 26, AlignLeft, AlignTop);
@@ -222,4 +222,4 @@ int32_t about_settings_app(void* p) {
     furi_record_close("gui");
 
     return 0;
-}
+}