[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/core/data_manager.py

@@ -0,0 +1,74 @@
+import sys
+from pathlib import Path
+
+import appdirs
+
+from .json_io import JsonIO
+
+jsonio = None
+basic_config = None
+
+basic_config_default = {
+    "DATA_PATH": None,
+    "COG_PATH_APPEND": "cogs",
+    "CORE_PATH_APPEND": "core"
+}
+
+config_dir = Path(appdirs.AppDirs("Red-DiscordBot").user_config_dir)
+config_file = config_dir / 'config.json'
+
+
+def load_basic_configuration(instance_name: str):
+    global jsonio
+    global basic_config
+
+    jsonio = JsonIO(config_file)
+
+    try:
+        config = jsonio._load_json()
+        basic_config = config[instance_name]
+    except (FileNotFoundError, KeyError):
+        print("You need to configure the bot instance using `redbot-setup`"
+              " prior to running the bot.")
+        sys.exit(1)
+
+
+def _base_data_path() -> Path:
+    if basic_config is None:
+        raise RuntimeError("You must load the basic config before you"
+                           " can get the base data path.")
+    path = basic_config['DATA_PATH']
+    return Path(path).resolve()
+
+
+def cog_data_path(cog_instance=None) -> Path:
+    """
+    Gets the base cog data path. If you want to get the folder with
+        which to store your own cog's data please pass in an instance
+        of your cog class.
+    :param cog_instance:
+    :return:
+    """
+    try:
+        base_data_path = Path(_base_data_path())
+    except RuntimeError as e:
+        raise RuntimeError("You must load the basic config before you"
+                           " can get the cog data path.") from e
+    cog_path = base_data_path / basic_config['COG_PATH_APPEND']
+    if cog_instance:
+        cog_path = cog_path / cog_instance.__class__.__name__
+    cog_path.mkdir(exist_ok=True, parents=True)
+
+    return cog_path.resolve()
+
+
+def core_data_path() -> Path:
+    try:
+        base_data_path = Path(_base_data_path())
+    except RuntimeError as e:
+        raise RuntimeError("You must load the basic config before you"
+                           " can get the core data path.") from e
+    core_path = base_data_path / basic_config['CORE_PATH_APPEND']
+    core_path.mkdir(exist_ok=True, parents=True)
+
+    return core_path.resolve()