Sticker pack access control (incl. kick)

[brian2509]

Solves #86 Solves #97

Admin:

• [x] Is the creator of the pack
• [x] Can kick others
• [x] Can add/remove stickers
• [x] Can invite others

User:

• [x] Can add stickers
• [x] Can remove their own stickers
• [x] Cannot remove someone else's stickers
• [x] Can invite others
• [x] Can see all invites

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[MKuijpers]

@brian2509 maybe remove the "Closes #" for this PR as they are only for the backend portion of the server? I will add those for the frontend PRs.

[brian2509]

Tested and should be ready for a merge.

[brian2509]

PR is done, needs front-end generation and integration. @MKuijpers