added option to hide player cards,

hiding cards now also affects windows
v0.3.7
fixed running out of memory on start/deck switch when logfile is too big
deck related buttons now disabled if no deck selected
all invalid chars should now be replaced when saving screenshots of decks
imported decks now save the url (also in notes). With that decks can now be overwritten when imported from the same url.

changed debug logging to trace. log file generation can be turn on via config (only).
Now being recorded for each deck: win/loss, cards drawn, played, mulligan.

Moved some things around
started working on stats window
button for stats, fixed opponent class not being recorded
deck stats saving consistent with #53
only creates new deck iteration of cards changed, changed deck name now saved to stats
new iteration check also takes count into account
win-loss ratio on decks (not sure it's staying there)