Begin of moving objects to types package

* Block(s)
* Transaction(s)

chain/types/common.go

@@ -0,0 +1,10 @@
+package types
+
+import (
+	"math/big"
+	"github.com/ethereum/go-ethereum/state"
+)
+
+type BlockProcessor interface {
+	ProcessWithParent(*Block, *Block) (*big.Int, state.Messages, error)
+}