Export API package from module to allow others to extend the generator.

src/core/de.evoal.generator.main/src/main/java/module-info.java

@@ -32,4 +32,6 @@ module de.evoal.generator.main {
     opens de.evoal.generator.main.cdi;
     opens de.evoal.generator.main.functions;
     opens de.evoal.generator.main.generators;
+
+    exports de.evoal.generator.api;
 }