Support all Messageables in bot.embed_requested() (#5576)

* Support all Messageables in bot.embed_requested

* Update usage in core

* Simplify [p]contact

This couldn't be done before this change.

I have also simplified getting embed color.

* Make `True` the new default for `check_permissions` kwarg

redbot/core/commands/context.py

@@ -231,17 +231,20 @@ class Context(DPYContext):
 
     async def embed_requested(self):
         """
-        Simple helper to call bot.embed_requested
-        with logic around if embed permissions are available
+        Short-hand for calling bot.embed_requested with permission checks.
+
+        Equivalent to:
+
+        .. code:: python
+
+            await ctx.bot.embed_requested(ctx)
 
         Returns
         -------
         bool:
             :code:`True` if an embed is requested
         """
-        return await self.bot.embed_requested(
-            self.channel, self.author, command=self.command, check_permissions=True
-        )
+        return await self.bot.embed_requested(self)
 
     async def maybe_send_embed(self, message: str) -> discord.Message:
         """

redbot/core/commands/help.py

@@ -721,9 +721,7 @@ class RedHelpFormatter(HelpFormatterABC):
                 yield obj
 
     async def embed_requested(self, ctx: Context) -> bool:
-        return await ctx.bot.embed_requested(
-            channel=ctx.channel, user=ctx.author, command=red_help, check_permissions=True
-        )
+        return await ctx.bot.embed_requested(channel=ctx.channel, command=red_help)
 
     async def command_not_found(self, ctx, help_for, help_settings: HelpSettings):
         """