Option to Display Tags as a Tree

[Immac]

Add tree view as an option, you'd have to repeat the tags that have several parents (Which means it won't be a real tree but I digress), but it it should be more compact and less cluttered than a list when focused on only a specific part of the tag hierarchy.

[CyanVoxel]

It's a great idea, but a duplicate of #19. I'm closing this one in favor of continuing the discussion over there