[V3 Config] Redesign "all_from_XXX" and "clear_all" methods (#1033)

* Added alternative to all_from_kind

* Returned dicts include default values

Also added docstrings

Also removed all_globals since it's kind of redundant and it wasn't working out for me

* Refactored clear_all

* Tests

* Tests again..

* Make all new methods coroutines

redbot/core/bank.py

@@ -322,7 +322,7 @@ async def get_guild_accounts(guild: discord.Guild) -> List[Account]:
         raise RuntimeError("The bank is currently global.")
 
     ret = []
-    accs = await _conf.member(guild.owner).all_from_kind()
+    accs = await _conf.all_members(guild)
     for user_id, acc in accs.items():
         acc_data = acc.copy()  # There ya go kowlin
         acc_data['created_at'] = _decode_time(acc_data['created_at'])
@@ -353,7 +353,7 @@ async def get_global_accounts(user: discord.User) -> List[Account]:
         raise RuntimeError("The bank is not currently global.")
 
     ret = []
-    accs = await _conf.user(user).all_from_kind()  # this is a dict of user -> acc
+    accs = await _conf.all_users()  # this is a dict of user -> acc
     for user_id, acc in accs.items():
         acc_data = acc.copy()
         acc_data['created_at'] = _decode_time(acc_data['created_at'])
@@ -412,8 +412,6 @@ async def is_global() -> bool:
 async def set_global(global_: bool, user: Union[discord.User, discord.Member]) -> bool:
     """Set global status of the bank.
 
-    Requires the user parameter for technical reasons.
-
     .. important::
 
         All accounts are reset when you switch!
@@ -422,8 +420,6 @@ async def set_global(global_: bool, user: Union[discord.User, discord.Member]) -
     ----------
     global_ : bool
         :code:`True` will set bank to global mode.
-    user : `discord.User` or `discord.Member`
-        Must be a Member object if changing TO global mode.
 
     Returns
     -------
@@ -440,12 +436,9 @@ async def set_global(global_: bool, user: Union[discord.User, discord.Member]) -
         return global_
 
     if is_global():
-        await _conf.user(user).clear_all()
-    elif isinstance(user, discord.Member):
-        await _conf.member(user).clear_all()
+        await _conf.clear_all_users()
     else:
-        raise RuntimeError("You must provide a member if you're changing to global"
-                           " bank mode.")
+        await _conf.clear_all_members()
 
     await _conf.is_global.set(global_)
     return global_