[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/SConscript

@@ -0,0 +1,20 @@
+Import("env")
+
+env.Append(
+    CPPPATH=[
+        "#/lib/flipper_application",
+    ],
+    SDK_HEADERS=[
+        File("#/lib/flipper_application/flipper_application.h"),
+    ],
+)
+
+
+libenv = env.Clone(FW_LIB_NAME="flipper_application")
+libenv.ApplyLibFlags()
+
+sources = libenv.GlobRecursive("*.c")
+
+lib = libenv.StaticLibrary("${FW_LIB_NAME}", sources)
+libenv.Install("${LIB_DIST_DIR}", lib)
+Return("lib")