SABP (Service Area Broadcast Protocol) definitions

Using ASN.1 syntax copy+pasted from 3GPP TS 25.419 version 15.0.0 Release 15

Change-Id: Iab44cca10a664bbe2823a4183bca055ac8851137
diff --git a/library/sabp/SABP_Types.ttcn b/library/sabp/SABP_Types.ttcn
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+module SABP_Types {
+
+	import from SABP_PDU_Descriptions language "ASN.1:1997" all;
+
+	external function enc_SABP_PDU(in SABP_PDU pdu) return octetstring;
+	external function dec_SABP_PDU(in octetstring stream) return SABP_PDU;
+}