[Core] Removed flusher, helpers now save on changes

After some considerations, while the flusher was an interesting experiment, it doesn't seem to be reliable enough. It's been removed in favor of the helpers autosaving on any change in a threadsafe way.

main.py

@@ -1,7 +1,6 @@
 from core.bot import Red, ExitCodes
 from core.global_checks import init_global_checks
 from core.events import init_events
-from core.json_flusher import init_flusher
 from core.settings import parse_cli_flags
 import asyncio
 import discord
@@ -53,7 +52,6 @@ def init_loggers(cli_flags):
 if __name__ == '__main__':
     cli_flags = parse_cli_flags()
     log = init_loggers(cli_flags)
-    init_flusher()
     description = "Red v3 - Alpha"
     red = Red(cli_flags, description=description, pm_help=None)
     init_global_checks(red)