templates: add message forwarding

[SoggySaussages]

Adds message forwarding capability to complexMessage. Cannot be done in channels YAGPDB doesn't have read message
perms in, or a channel outside the guild. Effectively no different from the message link preview CC but utilizes Discord's UI,
additionally removes the need to parse a message link and get the message, nor build your own embed or other means of
providing a message timestamp, link, and indication that it was a forwarded message. It also looks neat.

Signed-off-by: SoggySaussages vmdmaharaj@gmail.com

[ashishjh-bst]

Can you add example template too please?

[galen8183]

Can you add example template too please?

Here's an example:

{{ sendMessage nil (complexMessage
    "forward" (sdict
        "channel" .Channel.ID
        "message" <messageID>
    )
) }}

[SoggySaussages]

Can you add example template too please?

Here's an example:

{{ sendMessage nil (complexMessage
    "forward" (sdict
        "channel" .Channel.ID
        "message" <messageID>
    )
) }}

I'm SoggySaussages and I approve this message.