Enh: Implement Profile Polls

[ArchBlood]

Can I get a look over @luke-?

[buddh4]

I've checked the Active developements and saw this thinking its an issue not a pull request, so I did implement it instead of reviewing your PR. Nontheless here is my feedback regarding your PR:

• I did not fix the friend group in the create poll permission
• You've forgotten to return the create poll permission for users in Module::getPermissions, which would make the permission not editable on profile level (perhaps this was intended)
• Added feature to changelog

cd81cee

Otherwise you PR looks great, thanks for the effort!