Fix auto-payment for reusable filter-land mana abilities

[Madwand99]

This fixes a mana-planning blind spot where Forge ignored mana abilities that had mana in their activation cost. That meant reusable filter lands like Flooded Grove were not considered by available-action detection or auto-payment, so a hand containing Rampant Growth could be treated as unplayable even with a valid line through Plains -> Flooded Grove. This also prevents auto-yield from fast-forwarding when you have viable spells to play!

Changes:

• Allow AI/auto-payment mana discovery to consider mana-costed mana abilities when their activation costs use reusable resources, such as filter lands.
• Prefer multi-mana producers for colored costs when generic mana remains, so a filter land can produce mana that pays both the colored requirement and leftover generic cost.