Implement a least breaking approach to slash commands (#39)

* Most slash command support completed, needs some debugging (and reindent)

* Implement a ctx.send helper for slash commands

* Add group command support

* Add Option converter, fix default optional, fix help command

* Add client.setup and move readying commands to that

* Implement _FakeSlashMessage.from_interaction

* Rename normmal_command to message_command

* Add docs for added params

* Add slash_command_guilds to bot and decos

* Fix merge conflict

* Remove name from commands.Option, wasn't used

* Move slash command processing to BotBase.process_slash_commands

* Create slash_only.py

Basic example for slash commands

* Create slash_and_message.py

Basic example for mixed commands

* Fix slash_command and normal_command bools

* Add some basic error handling for registration

* Fixed converter upload errors

* Fix some logic and make an actual example

* Thanks Safety Jim

* docstrings, *args, and error changes

* Add proper literal support

* Add basic documentation on slash commands

* Fix non-slash command interactions

* Fix ctx.reply in slash command context

* Fix typing on Context.reply

* Fix multiple optional argument sorting

* Update ctx.message docs to mention error instead of warning

* Move slash command creation to BotBase

* Fix code style issues with Black

* Rearrange some stuff and add flag support

* Change some errors and fix interaction.channel fixing

* Fix slash command quoting for *args

Co-authored-by: iDutchy <42503862+iDutchy@users.noreply.github.com>
Co-authored-by: Lint Action <lint-action@samuelmeuli.com>

discord/ext/commands/help.py

@@ -615,7 +615,7 @@ class HelpCommand:
         :class:`.abc.Messageable`
             The destination where the help command will be output.
         """
-        return self.context.channel
+        return self.context
 
     async def send_error_message(self, error):
         """|coro|
@@ -977,6 +977,10 @@ class DefaultHelpCommand(HelpCommand):
         for page in self.paginator.pages:
             await destination.send(page)
 
+        interaction = self.context.interaction
+        if interaction is not None and destination == self.context.author and not interaction.response.is_done():
+            await interaction.response.send_message("Sent help to your DMs!", ephemeral=True)
+
     def add_command_formatting(self, command):
         """A utility function to format the non-indented block of commands and groups.
 
@@ -1007,7 +1011,7 @@ class DefaultHelpCommand(HelpCommand):
         elif self.dm_help is None and len(self.paginator) > self.dm_help_threshold:
             return ctx.author
         else:
-            return ctx.channel
+            return ctx
 
     async def prepare_help_command(self, ctx, command):
         self.paginator.clear()