Add new option to hide voting when not allowed

[hackerESQ]

Fixes #32

Changes proposed in this pull request: This adds a new option in extension settings that allows admins to hide voting options when the post/tag/user does not have permissions to vote.

Reviewers should focus on: This only adds a new configuration option. But perhaps the logic to hide should be reviewed:

if (setting('hideIfNoPermissions', true) && !post.canVote() && !post.canSeeVotes()) {
   return;
}

This same logic was added to the alternate layout as well.

Screenshot

Confirmed

• [X] Frontend changes: tested on a local Flarum installation.
• [X] Backend changes: tests are green (run composer test).

Required changes: N/A

[hackerESQ]

Sounds good! Let me know if that works!

[DavideIadeluca]

Hi @hackerESQ, similarly like in https://github.com/FriendsOfFlarum/gamification/pull/114 this PR has merge conflicts. Please reset the history to the first commit you made on this branch, amend it and force push without the dist files being changed. Thanks!