[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/subghz_keystore.h

@@ -4,6 +4,10 @@
 #include <m-array.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct {
     string_t name;
     uint64_t key;
@@ -70,3 +74,7 @@ bool subghz_keystore_raw_encrypted_save(
  * @return true On success
  */
 bool subghz_keystore_raw_get_data(const char* file_name, size_t offset, uint8_t* data, size_t len);
+
+#ifdef __cplusplus
+}
+#endif