core,vm: adjust binary (de-)serialization syscalls

Related #1027.

1. Move System.Runtime.(De)serialize to System.Binary.*
2. Rename compiler stubs.
3. Adjust opcode prices.

pkg/interop/binary/binary.go

@@ -0,0 +1,18 @@
+/*
+Package binary provides binary serialization routines.
+*/
+package binary
+
+// Serialize serializes any given item into a byte slice. It works for all
+// regular VM types (not ones from interop package) and allows to save them in
+// storage or pass into Notify and then Deserialize them on the next run or in
+// the external event receiver. It uses `System.Binary.Serialize` syscall.
+func Serialize(item interface{}) []byte {
+	return nil
+}
+
+// Deserialize unpacks previously serialized value from a byte slice, it's the
+// opposite of Serialize. It uses `System.Binary.Deserialize` syscall.
+func Deserialize(b []byte) interface{} {
+	return nil
+}