Rework the picture download behavior

Should fix #412
Corrected spacing
Partial Card Name Search

+ Card searches now do partial string matches, rather than needing to
match the beginning of the string.
Oracle: add button to restore default download url

Should avoid the problem explained in #414
Fix #408

Gray out "only buddies/only reg users" in the “create game” dialog if
the user is unregistered
Merge pull request #420 from ctrlaltca/unreg_create_game

Fix #408
Merge pull request #419 from ctrlaltca/oracle_url

Oracle: add button to restore default download url
Merge pull request #416 from poixen/partialsearch

Partial Card Name Search
Merge pull request #415 from ctrlaltca/no_pictures_yet

Rework the picture download behavior