contrib-gc-test.lsl indicates that replacing list elements rather than
deleting and adding them is better for memory comsumption

changed preference to replacing instead of deleting and adding
allow for more debugging on local chat

prepared to handle reading of set and btn cards differently
do animations sanely --- untested yet
do anims sanely: script now compiles

Only 7 changes needed, and 6 of them were from copying --- not bad :)
doing animations sanely: seems to work, sync needs to be implemented
doing animations sanely: sync is implemented, some cleanups

Needs more testing, and repeating anims require a stupid amount of
script time.  The timer shouldn´t (need to be) so short.