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/u8g2/u8x8_gpio.c

@@ -33,13 +33,10 @@
 
 */
 
-
 #include "u8x8.h"
 
-
-void u8x8_gpio_call(u8x8_t *u8x8, uint8_t msg, uint8_t arg)
-{
-  u8x8->gpio_and_delay_cb(u8x8, msg, arg, NULL);
+void u8x8_gpio_call(u8x8_t* u8x8, uint8_t msg, uint8_t arg) {
+    u8x8->gpio_and_delay_cb(u8x8, msg, arg, NULL);
 }
 
 /*