Card definitions are now stored in data/cards/ in a subdirectory for each
set as YAML files.
YAML is still human readable but stricter and better to handle in code
than ini.

The latex filesystem layout resembles the card definition layout and
is created by the Makefile from the YAML card definitions and must not
be regenerated each time by hand.

* make it usable for permanents if you only have one spawn tile
* let you choose new targets
* be specific about how to copy a permanent (by creating a token)

Make transmute! a stronger reactive play by putting the store card into hand.

* Armor that stops you from moving is stupid
* Make Buff spells more flexible
* Introduce spell based exiling of cards
* Let heal! remove ALL poison

Heal! now can also remove poison counters.
Add '!' to all spells.
Capitalize some effects.
Update file names in Collections.