Fix multiple issues with ranked play card audio previews

[peppy]

The main goal here is to:

• Make keyboard selection play previews just like hovering does with mouse.
• Make sure cards don't play previews when they are in animation.
• Drive by fix to fix toggling discard not working via keyboard.

(I really want to rewrite all these classes, the structure is not great)

[smoogipoo]

Code seems extremely convoluted but I suppose it does what it says.

[peppy]

Code seems extremely convoluted but I suppose it does what it says.

As per comment in OP, I'm just working with what is thrown at me at this point. I'd say the convoluted part is unavoidable based on what's already there. Refactor comes later or never we'll see.