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/local/Inc/main.h

@@ -2,6 +2,10 @@
 #include <stdlib.h>
 #include <limits.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define HAL_MAX_DELAY INT_MAX
 
 typedef uint32_t UART_HandleTypeDef;
@@ -16,3 +20,7 @@ typedef uint32_t TIM_HandleTypeDef;
 #define LED_GREEN_GPIO_Port "Green:"
 #define LED_BLUE_Pin 1
 #define LED_BLUE_GPIO_Port "Blue:"
+
+#ifdef __cplusplus
+}
+#endif