cli: allow to specify cosigners with Neo addresses

Make it a bit more usable.

cli/contract_test.go

@@ -187,6 +187,9 @@ func TestComlileAndInvokeFunction(t *testing.T) {
 	e.Run(t, "neo-go", "contract", "testinvokescript",
 		"--rpc-endpoint", "http://"+e.RPC.Addr,
 		"--in", nefName, "--", util.Uint160{1, 2, 3}.StringLE())
+	e.Run(t, "neo-go", "contract", "testinvokescript",
+		"--rpc-endpoint", "http://"+e.RPC.Addr,
+		"--in", nefName, "--", address.Uint160ToString(util.Uint160{1, 2, 3}))
 
 	e.In.WriteString("one\r")
 	e.Run(t, "neo-go", "contract", "deploy",

cli/smartcontract/smart_contract.go

@@ -266,8 +266,8 @@ func NewCommands() []cli.Command {
    Signers represent a set of Uint160 hashes with witness scopes and are used
    to verify hashes in System.Runtime.CheckWitness syscall. First signer is treated
    as a sender. To specify signers use signer[:scope] syntax where
-    * 'signer' is hex-encoded 160 bit (20 byte) LE value of signer's address,
-                 which could have '0x' prefix.
+    * 'signer' is a signer's address (as Neo address or hex-encoded 160 bit (20 byte)
+               LE value with or without '0x' prefix).
     * 'scope' is a comma-separated set of cosigner's scopes, which could be:
         - 'None' - default witness scope which may be used for the sender
 			       to only pay fee for the transaction.
@@ -286,9 +286,9 @@ func NewCommands() []cli.Command {
    neo-go RPC server only. C# implementation does not support scopes capability.
 
    Examples:
-    * '0000000009070e030d0f0e020d0c06050e030c02'
+    * 'NNQk4QXsxvsrr3GSozoWBUxEmfag7B6hz5'
+    * 'NVquyZHoPirw6zAEPvY1ZezxM493zMWQqs:Global'
     * '0x0000000009070e030d0f0e020d0c06050e030c02'
-    * '0x0000000009070e030d0f0e020d0c06050e030c02:Global'
     * '0000000009070e030d0f0e020d0c06050e030c02:CalledByEntry,CustomGroups'   
 `,
 				Action: testInvokeFunction,
@@ -888,7 +888,11 @@ func parseCosigner(c string) (transaction.Signer, error) {
 	if len(s) == 2*util.Uint160Size+2 && s[0:2] == "0x" {
 		s = s[2:]
 	}
+	if len(s) == util.Uint160Size*2 {
 		res.Account, err = util.Uint160DecodeStringLE(s)
+	} else {
+		res.Account, err = address.StringToUint160(s)
+	}
 	if err != nil {
 		return res, err
 	}