Add forum-integrated mod icons

[vendethiel]

Those would be icons to lock/move/(delete?)/... a topic from viewforum.php, instead of having to open a topic and scroll down to do that. I don't think we need more than that (no quick title form forum).

The idea is from a phpBB2 mod that does exactly this.

This should be simple enough, but requires to have "icons" for lock/move/..., I need to check if we correctly have those for every templates (I think we do).

[vendethiel]

Actually, @MightyGorgon said he wanted to do it because it was a template-y change.

[MWE001]

This would actually be a decent feature to have.