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/f3/Inc/bq27220.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdint.h>
+
+/* Initialize Driver */
+void bq27220_init();
+
+/* Get battery voltage in mV */
+uint16_t bq27220_get_voltage();
+
+/* Get current in mA */
+int16_t bq27220_get_current();
+
+/* Get compensated full charge capacity in in mAh */
+uint16_t bq27220_get_full_charge_capacity();
+
+/* Get remaining capacity in in mAh */
+uint16_t bq27220_get_remaining_capacity();
+
+/* Get predicted remaining battery capacity in percents */
+uint16_t bq27220_get_state_of_charge();