20+ reaction support

[MaxKosi]

closes #65 one day

Done:

messageID is a list now
createEmbed returns a list of embeds
reactions are added to the embeds
adding roles
updating the event
signups / reactions work
command functions
dead code parts of messageID
Saving/Loading/snycing
on_raw_reaction_add

To Check:

make linter happy (:

[Gehock]

This is a very promising start. I simplified createAdditionalEmbed a bit, now there's slightly less duplicate code.

I think it would be more beneficial to try to add as many additional roles to the main message as possible. Normally the main message can fit quite a few additional roles before needing extra space, with this current setup adding even a single additional role will result in an extra message. I think the basic idea here is good, but instead of always splitting the Additional group into a separate message, we'd have to count the number of roles/reactions and create a new message only if that number exceeds 20.

Notes about my changes: I commented out some functionality related to the message handling so that I could make the bot display the embeds generated by createAdditionalEmbed. The logic for handling multiple messages and their IDs is currently missing completely, see the TODO notes in my commit.

[MaxKosi]

This is much better than my start. I didn't really have time to improve the code myself. BTW I might not have too much time until next week, because of another project. So if you want to continue this, feel free to do so. I don't have any local changes atm. I will look at any changes though so I can continue or help if necessary

[MaxKosi]

I re-added the emojis - they dont have a function yet again but theyre added correctly.
You might want to look over it and maybe improve it. I have made quiet a few changes to messageFunctions

And added a TODO for the updateReactions function because I scrapped the more efficient part for now. Needs to be implemented again

BTW I havent got the Linter plugin yet, because it doesnt work yet. Ill fix the errors in the next commit
^ I didnt

[MaxKosi]

This pull request needs in-depth testing. I haven't found anything so far. But there might be a few things that I haven't seen.

There are 2 TODOs in messageFunctions.py. The one for syncMessages is obsolete but I forgot to remove the comment. Just saw that. The other one needs improvement but works,

[Gehock]

This feature is slowly starting to take shape. Creating and sorting multi-message events works now. Some things to still implement:

• Adding/removing only updated reactions instead of everything. Updating reactions is so slow that we should only touch the ones we have to
• The !removereaction command. There doesn't seem to be any kind of multi-message support in it yet Replaced with !removerole and !removemainrole
• Message sorting when adding a new message:
  • when adding a new embed, both messages are created at the bottom and not sorted afterwards
  • instead, should only create one extra message and shuffle everything else forwards

[MaxKosi]

Hey, as you've probably noticed, currently I dont have time to improve this PR. I have to put it on hold until decembre (probably). I would prefer if you would take care of this, if you have time and motivation, since this code has to be checked on every other change made to the master.

[Gehock]

Yeah, no worries. There's not really a rush with feature, I've been improving it every now and then when I've had the time.