[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/flipper_application/application_manifest.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FAP_MANIFEST_MAGIC 0x52474448
+#define FAP_MANIFEST_SUPPORTED_VERSION 1
+
+#define FAP_MANIFEST_MAX_APP_NAME_LENGTH 32
+#define FAP_MANIFEST_MAX_ICON_SIZE 32 // TODO: reduce size?
+
+#pragma pack(push, 1)
+
+typedef struct {
+    uint32_t manifest_magic;
+    uint32_t manifest_version;
+    union {
+        struct {
+            uint16_t minor;
+            uint16_t major;
+        };
+        uint32_t version;
+    } api_version;
+    uint16_t hardware_target_id;
+} FlipperApplicationManifestBase;
+
+typedef struct {
+    FlipperApplicationManifestBase base;
+    uint16_t stack_size;
+    uint32_t app_version;
+    char name[FAP_MANIFEST_MAX_APP_NAME_LENGTH];
+    char has_icon;
+    char icon[FAP_MANIFEST_MAX_ICON_SIZE];
+} FlipperApplicationManifestV1;
+
+typedef FlipperApplicationManifestV1 FlipperApplicationManifest;
+
+#pragma pack(pop)
+
+#ifdef __cplusplus
+}
+#endif