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/power_observer/power_observer.c

@@ -0,0 +1,33 @@
+#include <furi.h>
+#include <furi_hal.h>
+#include <notification/notification_messages.h>
+
+const NotificationMessage message_green_110 = {
+    .type = NotificationMessageTypeLedGreen,
+    .data.led.value = 110,
+};
+
+static const NotificationSequence sequence_overconsumption = {
+    &message_green_110,
+    &message_red_255,
+    &message_delay_100,
+    NULL,
+};
+
+int32_t power_observer_srv(void* p) {
+    NotificationApp* notifications = furi_record_open("notification");
+
+    const float overconsumption_limit = 0.03f;
+
+    while(true) {
+        float current = -furi_hal_power_get_battery_current(FuriHalPowerICFuelGauge);
+
+        if(current >= overconsumption_limit) {
+            notification_message_block(notifications, &sequence_overconsumption);
+        }
+
+        delay(1000);
+    }
+
+    return 0;
+}