[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

tests/cogs/downloader/test_downloader.py

@@ -1,9 +1,10 @@
 from collections import namedtuple
-from raven.versioning import fetch_git_sha
+from pathlib import Path
 
 import pytest
-from cogs.downloader.repo_manager import RepoManager, Repo
-from pathlib import Path
+from raven.versioning import fetch_git_sha
+
+from redbot.cogs.downloader.repo_manager import RepoManager, Repo
 
 
 async def fake_run(*args, **kwargs):
@@ -37,8 +38,6 @@ def repo_manager(tmpdir_factory, config):
 
 @pytest.fixture
 def repo(tmpdir):
-    from cogs.downloader.repo_manager import Repo
-
     repo_folder = Path(str(tmpdir)) / 'repos' / 'squid'
     repo_folder.mkdir(parents=True, exist_ok=True)
 
@@ -69,8 +68,6 @@ def bot_repo(event_loop):
 
 
 def test_existing_git_repo(tmpdir):
-    from cogs.downloader.repo_manager import Repo
-
     repo_folder = Path(str(tmpdir)) / 'repos' / 'squid' / '.git'
     repo_folder.mkdir(parents=True, exist_ok=True)
 
@@ -103,7 +100,7 @@ async def test_clone_repo(repo_norun, capsys):
 
 @pytest.mark.asyncio
 async def test_add_repo(monkeypatch, repo_manager):
-    monkeypatch.setattr("cogs.downloader.repo_manager.Repo._run",
+    monkeypatch.setattr("redbot.cogs.downloader.repo_manager.Repo._run",
                         fake_run_noprint)
 
     squid = await repo_manager.add_repo(

tests/cogs/downloader/test_installable.py

@@ -1,9 +1,10 @@
-import pytest
 import json
-
-from cogs.downloader.installable import Installable, InstallableType
 from pathlib import Path
 
+import pytest
+
+from redbot.cogs.downloader.installable import Installable, InstallableType
+
 INFO_JSON = {
     "author": (
         "tekulvw",