FL-339: cli diagnostic interface for power subsystem. (#256)

* Core, API: add externs for c++
* Makefile: improve debug speed, flash with openocd, cleanup f2 config
* Power: add cli diagnostic.
* Local: fix api hal externs
* Local: fix externs in main and flipper_hal
* F2: power state dump stabs
* Bootloader flashing with openocd
* F3: move bq drivers to libs
* temporary do not build drivers on local
* temporary do not build drivers on f2

Co-authored-by: aanper <mail@s3f.ru>

lib/drivers/bq25896.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+/* Initialize Driver */
+void bq25896_init();
+
+/* Send device into shipping mode */
+void bq25896_poweroff();
+
+/* Is currently charging */
+bool bq25896_is_charging();
+
+/* Enable otg */
+void bq25896_enable_otg();
+
+/* Disable otg */
+void bq25896_disable_otg();
+
+/* Get VBUS Voltage in mV */
+uint16_t bq25896_get_vbus_voltage();
+
+/* Get VSYS Voltage in mV */
+uint16_t bq25896_get_vsys_voltage();
+
+/* Get VBAT Voltage in mV */
+uint16_t bq25896_get_vbat_voltage();
+
+/* Get VBAT current in mA */
+uint16_t bq25896_get_vbat_current();
+
+/* Get NTC voltage in mpct of REGN */
+uint32_t bq25896_get_ntc_mpct();