[#770] pkg/morph: Rename all parsers and handlers structs/interfaces

Prepare all listening structures for notary events:
rename(add prefix/suffix 'notification') all
notification specific handlers/parsers.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/morph/event/parsers.go

@@ -0,0 +1,54 @@
+package event
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+)
+
+// NotificationParser is a function that constructs Event
+// from the StackItem list.
+type NotificationParser func([]stackitem.Item) (Event, error)
+
+// NotificationParserInfo is a structure that groups
+// the parameters of particular contract
+// notification event parser.
+type NotificationParserInfo struct {
+	scriptHashWithType
+
+	p NotificationParser
+}
+
+type wrongPrmNumber struct {
+	exp, act int
+}
+
+// WrongNumberOfParameters returns an error about wrong number of smart contract parameters.
+func WrongNumberOfParameters(exp, act int) error {
+	return &wrongPrmNumber{
+		exp: exp,
+		act: act,
+	}
+}
+
+func (s wrongPrmNumber) Error() string {
+	return fmt.Errorf("wrong parameter count: expected %d, has %d", s.exp, s.act).Error()
+}
+
+// SetParser is an event parser setter.
+func (s *NotificationParserInfo) SetParser(v NotificationParser) {
+	s.p = v
+}
+
+func (s NotificationParserInfo) parser() NotificationParser {
+	return s.p
+}
+
+// SetType is an event type setter.
+func (s *NotificationParserInfo) SetType(v Type) {
+	s.typ = v
+}
+
+func (s NotificationParserInfo) getType() Type {
+	return s.typ
+}