Sudden illness tweak, two more cards expanding on the theme.

Made Sudden Illness cost 3. Added two colourless cards, one which does 1 hp for 2 mana and one that does 1 hp for 0 mana half the time. Since VS ai seems to be broken, none of these were really tested. Made the deck builder only accept 3 duplicates of cards, in accordance with the current fashion. Merged frogatto .gitignore into our tiny one.