added basic card draw replacement,

auto=replacedraw choice damage:2

auto=replacedraw choice draw:2 noreplace

notice noreplace exempts the draw from sending a draw event. draw events and drawn events are seperate events.

added dredge and it's rules.

[card]
name=Dakmor Salvage
auto=tap
auto={t}:add{b}
dredge=dredge(2)
text=Dakmor Salvage enters the battlefield tapped. -- {T}: Add {B} to your mana pool. -- Dredge 2 (If you would draw a card, instead you may put exactly two cards from the top of your library into your graveyard. If you do, return this card from your graveyard to your hand. Otherwise, draw a card.)
type=Land
[/card]

projects/mtg/src/MTGCardInstance.cpp

@@ -163,6 +163,7 @@ void MTGCardInstance::initMTGCI()
     mPropertiesChangedSinceLastUpdate = false;
     stillNeeded = true;
     kicked = 0;
+    dredge = 0;
     chooseacolor = -1;
     chooseasubtype = "";
     coinSide = -1;