Add extra tag search parameters to find cards

[jleclanche]

Examples:

# Find all cards with the CHARGE tag set
!card CHARGE=1
!card 197=1

# Find all cards that cost 4 mana
!card COST=4
!card 48=4

# Find all Dragons
!card CARDRACE=DRAGON
!card CARDRACE=24
!card 200=24
!card 200=DRAGON

# Find all 10-mana dragons without taunt
!card COST=10 CARDRACE=DRAGON TAUNT=0 

[jleclanche]

I think this code path would basically trigger if there's an = in the query. It would split the query parameters on whitespace, then split on =, parse the left side as a GameTag, the right side as an int.

If the right side is not an int (eg in the case of CARDRACE) it would have to attempt to parse as the corresponding enum to the tag.