add command to echo a message as the bot in a channel.

Command errors are not handled because that will be done in #22. Fixes #77

exts/base.py

@@ -163,6 +163,13 @@ class BaseCog(commands.Cog):
 
         await ctx.send(embed=embed)
 
+    @commands.command(name="echo", aliases=["e"], hidden=True)
+    @commands.check(cmn.check_if_owner)
+    async def _echo(self, ctx: commands.Context, channel: commands.TextChannelConverter, *, msg: str):
+        """Send a message in a channel as qrm. Only works within a server or DM to server,
+        not between servers."""
+        await channel.send(msg)
+
 
 def parse_changelog():
     changelog = OrderedDict()