Quoted message will not contain images, files or embeds

[Bios-Marcel]

The quoting feature currently only takes the plaintext from a message, meaning that all Files and embeds in the message will not be part of the quote. Since embeds aren't actually be meant to be used, those would have to be converted to plaintext before using them in a quote.

[MarvinKlar]

Gonna support the displaying of the urls from the files/images. Embeds are also going to be supported. But the issue #124 has to be done first.