idl-api: add idl_get_package_name() version() license()

idl/idl_api.ysl2

@@ -19,6 +19,18 @@ def "func:exists" {
 // ----------------------------------------------------------------------
 // idl-api (ysl2)
 // ----------------------------------------------------------------------
+def "func:idl_get_package_name" {
+    result "/pEpACIDLang/package/@name"
+}
+
+def "func:idl_get_package_version" {
+    result "/pEpACIDLang/package/version/text()"
+}
+
+def "func:idl_get_package_license" {
+    result "/pEpACIDLang/package/license/text()"
+}
+
 
 def "func:idl_typekind_is_defined" {
     param "typekind";