[Core V3] Make the bot data path configurable (#879)

* Initial commit

* Fix sentry

* Make cog manager install path work relative to the bot's dir

* Fix downloader to save data relative to the defined data folder

* Fix sentry test

* Fix downloader tests

* Change logfile location

* Add another line to codeowners

* Basic tests

* Fix versioning

* Add in FutureWarning for config file changes

* Add reference to issue

core/sentry_setup.py

@@ -27,12 +27,12 @@ include_paths = (
 client = None
 
 
-def init_sentry_logging(logger):
+def init_sentry_logging(bot, logger):
     global client
     client = Client(
         dsn=("https://27f3915ba0144725a53ea5a99c9ae6f3:87913fb5d0894251821dcf06e5e9cfe6@"
              "sentry.telemetry.red/19?verify_ssl=0"),
-        release=fetch_git_sha(str(Path.cwd()))
+        release=fetch_git_sha(str(bot.main_dir))
     )
 
     breadcrumbs.ignore_logger("websockets")