Use CSS-based thumbs-up/down ratings

[iMattPro]

Closes #112

CSS based (with FontAwesome) button and thumbs up/down. A little orange check mark is shown if you already voted on the badge that reflects your vote. Also title will show on hover saying if you already voted for/against the idea.

And in a topic. The check mark will update on the fly if you change your vote or remove your vote.

[iMattPro]

This PR also fixes a bug I found in the voting system:
If you open an idea that you already voted in, for example you thumbs-upped, then you remove your vote, then you try to put your up-vote back, it will instead count as a down-vote.

[iMattPro]

Here's an animation of it working, with the check marks for the user too.

[iMattPro]

Updated button colors

[iMattPro]

Also just added Ajax loading spinner/inidicators. I've been doing so much test voting I realized the lack of them sucks. Now all ajax ops have a spinner during their operations.

[Dode123]

Updated button colors

Looks very good @VSEphpbb :)

[iMattPro]

Updated animation of it in action