Power: bq25896 and bq27220 drivers, portable power api. (#224)

* Power: add portability layer, port to F3.
* F3: bq25896 driver stab
* GUI: new primary and secondary fonts
* F3: bq25896 register map, basic functions
* F3: move bq27220 command descritpion to separate file. Code format.
* Power: OTG enable/disable
* Power: choose more correct profile
* F3: pet bq25896 watchdog sometimes

firmware/targets/Inc/api-hal-power.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/* Initialize drivers */
+void api_hal_power_init();
+
+/* Get predicted remaining battery capacity in percents */
+uint8_t api_hal_power_get_pct();
+
+/* Get charging status */
+bool api_hal_power_is_charging();
+
+/* Poweroff system */
+void api_hal_power_off();
+
+/* OTG enable */
+void api_hal_power_enable_otg();
+
+/* OTG disable */
+void api_hal_power_disable_otg();