Add user setting to hide vote counts

Daniel Woznicki requested to merge dwoznicki/tildes:hide-vote-counts into master

This MR adds a checkbox on the user settings page to hide vote counts in the UI. All vote counts are hidden, including the vote counts on the current user's topics and comments as well as other users' topics and comments.

I did not hide vote counts in tildes/tildes/templates/topic_listing.rss.jinja2 or tildes/tildes/templates/topic_listing.atom.jinja2 since I'm unsure as to whether they are within the scope of this setting.

Implements #780

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