make !help nicer about sinusbot-command HOT 1 OPEN

With rich-embed it could look like this:

{
  "content": "**39** Commands found:",
  "embed": {
    "color": 14758968,
    "thumbnail": {
      "url": "https://sinusbot.github.io/logo.png"
    },
    "fields": [
      {
        "name": "!help",
        "value": "Displays this text"
      },
      {
        "name": "!man",
        "value": "Displays detailed help about a command if available"
      },
      {
        "name": "!register",
        "value": "Register a new user"
      }
    ]
  }
}

Benefits:

• looks nice :)
• has a higher character-limit (6000)

Downsides:

• harder to implement because...
  • we need to use backend.extended().createMessage() which needs a channel ID instead of using the reply() function
  • the construction is a bit more complex and we need to check more char-limits for the embed fields

The first downside is currently stopping me from implementing it because that makes is really annoying :/

from sinusbot-command.