[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>

scripts/assets.py

@@ -3,16 +3,12 @@
 from flipper.app import App
 from flipper.assets.icon import file2image
 
-import logging
-import argparse
-import subprocess
-import io
 import os
-import sys
 
 ICONS_SUPPORTED_FORMATS = ["png"]
 
 ICONS_TEMPLATE_H_HEADER = """#pragma once
+
 #include <gui/icon.h>
 
 """