[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/__init__.py

@@ -1,6 +1,7 @@
 from core.config import Config
 from subprocess import run, PIPE
 from collections import namedtuple
+from main import determine_main_folder
 
 __all__ = ["Config", "__version__"]
 version_info = namedtuple("VersionInfo", "major minor patch")
@@ -9,10 +10,12 @@ BASE_VERSION = version_info(3, 0, 0)
 
 
 def get_latest_version():
+    main_folder = determine_main_folder()
     try:
         p = run(
             "git describe --abbrev=0 --tags".split(),
-            stdout=PIPE
+            stdout=PIPE,
+            cwd=str(main_folder)
         )
     except FileNotFoundError:
         # No git