[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>

firmware/targets/f7/stm32wb55xx_ram_fw.ld

@@ -159,7 +159,7 @@ SECTIONS
   } >RAM1
 
   /* User_heap_stack section, used to check that there is enough RAM left */
-  ._user_heap_stack :
+  ._user_heap_stack(DSECT) :
   {
     . = ALIGN(8);
     __heap_start__ = .;
@@ -170,7 +170,7 @@ SECTIONS
   } >RAM1
 
   /* Free Flash space, that can be used for internal storage */
-  /*.free_flash(NOLOAD):
+  /*.free_flash(DSECT):
   {
     __free_flash_start__ = .;
     . = ORIGIN(FLASH) + LENGTH(FLASH);