ILLUSIONS: Add SequenceOpcodes skeleton class

engines/illusions/scriptopcodes.cpp

@@ -28,6 +28,28 @@
 
 namespace Illusions {
 
+// OpCall
+
+void OpCall::skip(uint size) {
+	_code += size;
+}
+
+byte OpCall::readByte() {
+	return *_code++;
+}
+
+int16 OpCall::readSint16() {
+	int16 value = READ_LE_UINT16(_code);
+	_code += 2;
+	return value;
+}
+
+uint32 OpCall::readUint32() {
+	uint32 value = READ_LE_UINT32(_code);
+	_code += 4;
+	return value;
+}
+
 // ScriptOpcodes
 
 ScriptOpcodes::ScriptOpcodes(IllusionsEngine *vm)