[V3 Everything] Package bot and write setup scripts (#964)

Ya'll are gonna hate me.

* Initial modifications

* Add initial setup.py

* working setup py help

* Modify setup file to package stuff

* Move a bunch of shit and fix imports

* Fix or skip tests

* Must add init files for find_packages to work

* Move main to scripts folder and rename

* Add shebangs

* Copy over translation files

* WORKING PIP INSTALL

* add dependency information

* Hardcoded version for now, will need to figure out a better way to do this

* OKAY ITS FINALLY FUCKING WORKING

* Add this guy

* Fix stuff

* Change readme to rst

* Remove double sentry opt in

* Oopsie

* Fix this thing

* Aaaand fix test

* Aaaand fix test

* Fix core cog importing and default cog install path

* Adjust readme

* change instance name from optional to required

* Ayyy let's do more dependency injection

redbot/cogs/downloader/json_mixins.py

@@ -0,0 +1,37 @@
+import json
+from pathlib import Path
+
+
+class RepoJSONMixin:
+    INFO_FILE_NAME = "info.json"
+
+    def __init__(self, repo_folder: Path):
+        self._repo_folder = repo_folder
+
+        self.author = None
+        self.install_msg = None
+        self.short = None
+        self.description = None
+
+        self._info_file = repo_folder / self.INFO_FILE_NAME
+        if self._info_file.exists():
+            self._read_info_file()
+
+        self._info = {}
+
+    def _read_info_file(self):
+        if not (self._info_file.exists() or self._info_file.is_file()):
+            return
+
+        try:
+            with self._info_file.open(encoding='utf-8') as f:
+                info = json.load(f)
+        except json.JSONDecodeError:
+            return
+        else:
+            self._info = info
+
+        self.author = info.get("author")
+        self.install_msg = info.get("install_msg")
+        self.short = info.get("short")
+        self.description = info.get("description")