Colorblind support for help system emojis

[Zabuzard]

Overview

Implements and closes #409.

As suggested by someone in #tj_suggestions who is red/green colorblind, the existing emojis for the help system status messages are barely distinguishable (🟢 🔴).

This changes the emojis to something that also has a different shape, while still having nice color coding for people who are not colorblind (✅ ❌).

Looks for example like this for a colorblind person (deuteranopia):

[interacsion]

as borgrel said here, #409 (comment)

as soon as u change it from colours to symbols you get the problem that symbols need to be interpretted:
does a tick mean the channel is occupied or does it mean that its available? plenty of ppl will think it means the one way and plenty will think it means the other

this could be rather confusing. I would suggest to add a legend to the embed body to make it clearer, maybe something like this:

✅ - free
❌ - used

[Zabuzard]

@MaiTheLord This is already explained in the message in the channel in our real server actually

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[interacsion]

I see. looks pretty good then!

[Zabuzard]

@MaiTheLord If you like it, feel free to leave an APPROVE in the code review, then I can merge it :)