[FL-2844] desktop: removing slideshow file when leaving slideshow view (#1762)

* [FL-2844] desktop: removing slideshow file when leaving slideshow view; vscode: fix for BM port fetcher; fap api: more symbols for LL
* desktop: actually removing slideshow file
* desktop: moved slideshow removal to scene code; fbt: better blackmagic device handling
* fbt: disabled pagination for gdb
* vscode: restored blackmagic command line
* fbt: fixed debug_other target; added debug_other_blackmagic
* furi: added furi_thread_suspend API group; fixed null-pointer deref for thread name; cleaned up RTOS config
* furi: changed thread state check to eTaskGetState

documentation/fbt.md

@@ -49,7 +49,7 @@ To run cleanup (think of `make clean`) for specified targets, add `-c` option.
 - `flash` - flash attached device with OpenOCD over ST-Link
 - `flash_usb`, `flash_usb_full` - build, upload and install update package to device over USB. See details on `updater_package`, `updater_minpackage` 
 - `debug` - build and flash firmware, then attach with gdb with firmware's .elf loaded
-- `debug_other` - attach gdb without loading any .elf. Allows to manually add external elf files with `add-symbol-file` in gdb
+- `debug_other`, `debug_other_blackmagic` - attach gdb without loading any .elf. Allows to manually add external elf files with `add-symbol-file` in gdb
 - `updater_debug` - attach gdb with updater's .elf loaded
 - `blackmagic` - debug firmware with Blackmagic probe (WiFi dev board)
 - `openocd` - just start OpenOCD