Furi: A Lot of Fixes (#3942)

- BT Service: cleanup code
- Dialog: correct release order in file browser
- Rpc: rollback to pre #3881 state
- Kernel: fix inverted behavior in furi_kernel_is_running
- Log: properly take mutex when kernel is not running
- Thread: rework tread control block scrubbing procedure, ensure that we don't do stupid things in idle task, add new priority for init task
- Timer: add control queue flush method, force flush on stop
- Furi: system init task now performs thread scrubbing
- BleGlue: add some extra checks
- FreeRTOSConfig: fix bunch of issues that were preventing configuration from being properly applied and cleanup

targets/f18/api_symbols.csv

@@ -1,5 +1,5 @@
 entry,status,name,type,params
-Version,+,76.0,,
+Version,+,77.0,,
 Header,+,applications/services/bt/bt_service/bt.h,,
 Header,+,applications/services/bt/bt_service/bt_keys_storage.h,,
 Header,+,applications/services/cli/cli.h,,
@@ -1102,6 +1102,7 @@ Function,-,ftello,off_t,FILE*
 Function,-,ftrylockfile,int,FILE*
 Function,-,funlockfile,void,FILE*
 Function,-,funopen,FILE*,"const void*, int (*)(void*, char*, int), int (*)(void*, const char*, int), fpos_t (*)(void*, fpos_t, int), int (*)(void*)"
+Function,-,furi_background,void,
 Function,+,furi_delay_ms,void,uint32_t
 Function,+,furi_delay_tick,void,uint32_t
 Function,+,furi_delay_until_tick,FuriStatus,uint32_t
@@ -1672,6 +1673,7 @@ Function,+,furi_thread_stdout_write,size_t,"const char*, size_t"
 Function,+,furi_thread_suspend,void,FuriThreadId
 Function,+,furi_thread_yield,void,
 Function,+,furi_timer_alloc,FuriTimer*,"FuriTimerCallback, FuriTimerType, void*"
+Function,+,furi_timer_flush,void,
 Function,+,furi_timer_free,void,FuriTimer*
 Function,+,furi_timer_get_expire_time,uint32_t,FuriTimer*
 Function,+,furi_timer_is_running,uint32_t,FuriTimer*