[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/toolbox/hmac_sha256.h

@@ -1,3 +1,10 @@
+#pragma once
+
+#include "sha256.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 typedef struct hmac_context {
     void (*init_hash)(const struct hmac_context* context);
@@ -25,3 +32,7 @@ void hmac_sha256_update(
     unsigned message_size);
 
 void hmac_sha256_finish(const hmac_sha256_context* ctx, const uint8_t* K, uint8_t* hash_result);
+
+#ifdef __cplusplus
+}
+#endif