Move redeem transactions creation client-side (#388)

* move OOR transaction creation client-side

* robust redeem tx checks

* optimize GetVtxos db call

* rename CompleteAsyncPayment --> SubmitRedeemTx

* fix permissions.go

common/types.go

@@ -0,0 +1,13 @@
+package common
+
+import (
+	"github.com/btcsuite/btcd/wire"
+	"github.com/btcsuite/btcwallet/waddrmgr"
+)
+
+type VtxoInput struct {
+	Outpoint    *wire.OutPoint
+	Amount      int64
+	Tapscript   *waddrmgr.Tapscript
+	WitnessSize int
+}