[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>

lib/subghz/transmitter.h

@@ -4,6 +4,10 @@
 #include "environment.h"
 #include "protocols/base.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct SubGhzTransmitter SubGhzTransmitter;
 
 /**
@@ -45,3 +49,7 @@ bool subghz_transmitter_deserialize(SubGhzTransmitter* instance, FlipperFormat*
  * @return LevelDuration 
  */
 LevelDuration subghz_transmitter_yield(void* context);
+
+#ifdef __cplusplus
+}
+#endif