core/vm: move Log to core/types

This significantly reduces the dependency closure of ethclient, which no
longer depends on core/vm as of this change.

All uses of vm.Logs are replaced by []*types.Log. NewLog is gone too,
the constructor simply returned a literal.

core/block_validator_test.go

@@ -24,7 +24,6 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/params"
@@ -77,7 +76,7 @@ func TestPutReceipt(t *testing.T) {
 	hash[0] = 2
 
 	receipt := new(types.Receipt)
-	receipt.Logs = vm.Logs{&vm.Log{
+	receipt.Logs = []*types.Log{{
 		Address:     addr,
 		Topics:      []common.Hash{hash},
 		Data:        []byte("hi"),