New Status filter

[Lodici]

I have added a new filter, "Status", to the card explorer. This adds the following options to filter the card pool -

• New: replaces the existing New Cards filter.
• Playable: display just the playable cards.
• Missing (valid): this displays cards that are missing but whose associated script was loaded without any parsing errors from scripts_missing.
• Missing (invalid): this displays cards that are missing but whose associated script was loaded with one or more parsing errors from scripts_missing.
• Script file missing: this displays cards which are missing and have no associated script file in the scripts_missing directory.

[Huggybaby]

Neat, this should make it easier to add cards.