* "Uncooperative cards" is now a warning.
* Cards and actions get "Then" invoked before the card processor considers erroring out.
* Terminal UI: Errors and warnings from actions are displayed during the response; they're not only added to the temporary messages now.
Only cards can block other cards or actions from being used due to urgency, so only display the `[URGENT!]` header for cards. Debug actions can't be blocked, so skip the "urgency conflict" check for those.
StatLiteral: just emit a stat in the obvious way. Plus helper functions.
Can also identify stats via struct tags, no more Stored type!
Can also identify stat methods via name (with compatible types).
Fixes some off-by-one errors. A 1-indexed UI in a 0-indexed language is always going to be prone to those and I will no doubt find more when I have enough of a test program to experiment with...
Make it possible for a card to display an option but not actually allow it to be selected. It's up to the UI layer to decide how to display options that are not enabled. The option text should probably contiain a note on why the option cannot be selected...
Stripping cards from the Hand will also be useful, so I pulled the logic of Strip out into arrayutil (more efficiently, too) and rewrote deck.Strip to use it.
Given a function that identifies cards to remove, remove them from the deck. This can be used to find and strip out cards that are only conditionally appropriate (and aren't appropriate anymore).
