C#: Add copy of shared functionality.

csharp/ql/src/utils/model-generator/ModelGeneratorUtils.qll

@@ -0,0 +1,29 @@
+import ModelGeneratorUtilsSpecific
+
+bindingset[input, output, kind]
+string asSummaryModel(TargetAPI api, string input, string output, string kind) {
+  result =
+    asPartialModel(api) + input + ";" //
+      + output + ";" //
+      + kind
+}
+
+bindingset[input, output]
+string asValueModel(TargetAPI api, string input, string output) {
+  result = asSummaryModel(api, input, output, "value")
+}
+
+bindingset[input, output]
+string asTaintModel(TargetAPI api, string input, string output) {
+  result = asSummaryModel(api, input, output, "taint")
+}
+
+bindingset[input, kind]
+string asSinkModel(TargetAPI api, string input, string kind) {
+  result = asPartialModel(api) + input + ";" + kind
+}
+
+bindingset[output, kind]
+string asSourceModel(TargetAPI api, string output, string kind) {
+  result = asPartialModel(api) + output + ";" + kind
+}