[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>

.vscode/example/settings.json

@@ -12,6 +12,9 @@
     "cortex-debug.openocdPath.windows": "${workspaceFolder}/toolchain/i686-windows/openocd/bin/openocd.exe",
     "cortex-debug.openocdPath.linux": "${workspaceFolder}/toolchain/x86_64-linux/openocd/bin/openocd",
     "cortex-debug.openocdPath.osx": "${workspaceFolder}/toolchain/x86_64-darwin/openocd/bin/openocd",
+    "cortex-debug.gdbPath.windows": "${workspaceFolder}/toolchain/i686-windows/bin/arm-none-eabi-gdb-py.bat",
+    "cortex-debug.gdbPath.linux": "${workspaceFolder}/toolchain/x86_64-linux/bin/arm-none-eabi-gdb-py",
+    "cortex-debug.gdbPath.osx": "${workspaceFolder}/toolchain/x86_64-darwin/bin/arm-none-eabi-gdb",
     "editor.formatOnSave": true,
     "files.associations": {
         "*.scons": "python",