Add workaround to fix gimp-3.0 types

Author: JumpLink

packages/generator-typescript/templates/gimp-3.0.d.ts

@@ -0,0 +1,8 @@
+// WORKAROUND: As long as ParamObject is not generated
+export class ParamObject extends GObject.ParamSpec {}
+
+// WORKAROUND: As long as ParamObject is not generated
+export class ParamItem extends GObject.ParamSpec {}
+
+// WORKAROUND: As long as ParamObject is not generated
+export class ParamArray extends GObject.ParamSpec {}