optional embed title field for ctx.maybe_send_embed()

### What component of Red (cog, command, API) would you like to see improvements on?

ctx.maybe_send_embed()

### Describe the enhancement you're suggesting.

In `ctx.maybe_send_embed()`, accept an optional kwarg for the title of the embed if it is able to be sent. This function has proved to be very helpful and takes the place of a manually created check-for-embed-permissions-and-send function in every cog, and it would be great to have this additional feature for when a title would be nice to have but is not required. Additionally, this could be expanded to accept every field a typical discord.Embed would accept, but currently the title field would be most useful.