[FL-2627] Flipper applications: SDK, build and debug system (#1387)

* Added support for running applications from SD card (FAPs - Flipper Application Packages)
* Added plugin_dist target for fbt to build FAPs
* All apps of type FlipperAppType.EXTERNAL and FlipperAppType.PLUGIN are built as FAPs by default
* Updated VSCode configuration for new fbt features - re-deploy stock configuration to use them
* Added debugging support for FAPs with fbt debug & VSCode
* Added public firmware API with automated versioning

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

firmware/targets/f7/furi_hal/furi_hal_flash.h

@@ -4,6 +4,10 @@
 #include <stdint.h>
 #include <stddef.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define FURI_HAL_FLASH_OB_RAW_SIZE_BYTES 0x80
 #define FURI_HAL_FLASH_OB_SIZE_WORDS (FURI_HAL_FLASH_OB_RAW_SIZE_BYTES / sizeof(uint32_t))
 #define FURI_HAL_FLASH_OB_TOTAL_VALUES (FURI_HAL_FLASH_OB_SIZE_WORDS / 2)
@@ -142,3 +146,7 @@ void furi_hal_flash_ob_apply();
  * @return     pointer to read-only data of OB (raw + complementary values)
  */
 const FuriHalFlashRawOptionByteData* furi_hal_flash_ob_get_raw_ptr();
+
+#ifdef __cplusplus
+}
+#endif