smartcontract: remove contract features

We're featureless now, all contracts have access to storage and payable status
is to be determined via new NEP. Follow neo-project/neo#2060.

pkg/compiler/compiler.go

@@ -13,7 +13,6 @@ import (
 	"path"
 	"strings"
 
-	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/nef"
 	"golang.org/x/tools/go/loader"
@@ -35,9 +34,6 @@ type Options struct {
 	// The name of the output for contract manifest file.
 	ManifestFile string
 
-	// Contract features.
-	ContractFeatures smartcontract.PropertyState
-
 	// Runtime notifications.
 	ContractEvents []manifest.Event
 
@@ -211,7 +207,7 @@ func CompileAndSave(src string, o *Options) ([]byte, error) {
 	}
 
 	if o.ManifestFile != "" {
-		m, err := di.ConvertToManifest(o.ContractFeatures, o.ContractEvents, o.ContractSupportedStandards...)
+		m, err := di.ConvertToManifest(o.ContractEvents, o.ContractSupportedStandards...)
 		if err != nil {
 			return b, fmt.Errorf("failed to convert debug info to manifest: %w", err)
 		}