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>

firmware/targets/f3/api-hal/api-hal-gpio.h

@@ -2,6 +2,10 @@
 #include "main.h"
 #include "stdbool.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // this defined in xx_hal_gpio.c, so...
 #define GPIO_NUMBER (16U)
 
@@ -67,3 +71,7 @@ static inline bool hal_gpio_read(const GpioPin* gpio) {
 bool hal_gpio_read_sd_detect(void);
 
 void enable_cc1101_irq();
+
+#ifdef __cplusplus
+}
+#endif