[#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/handlers.go

@@ -0,0 +1,30 @@
+package event
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/core/block"
+)
+
+// Handler is an Event processing function.
+type Handler func(Event)
+
+// BlockHandler is a chain block processing function.
+type BlockHandler func(*block.Block)
+
+// NotificationHandlerInfo is a structure that groups
+// the parameters of the handler of particular
+// contract event.
+type NotificationHandlerInfo struct {
+	scriptHashWithType
+
+	h Handler
+}
+
+// SetHandler is an event handler setter.
+func (s *NotificationHandlerInfo) SetHandler(v Handler) {
+	s.h = v
+}
+
+// Handler returns an event handler.
+func (s NotificationHandlerInfo) Handler() Handler {
+	return s.h
+}