Let enum arrays be saved as integers or strings (#1467)

* Let enums be saved as integers or strings as needed

* Add tests for int and varchar @DbArray enums

src/test/java/org/tests/model/array/IntEnum.java

@@ -0,0 +1,13 @@
+package org.tests.model.array;
+
+import io.ebean.annotation.DbEnumType;
+import io.ebean.annotation.DbEnumValue;
+
+public enum IntEnum {
+  ZERO, ONE, TWO;
+
+  @DbEnumValue(storage = DbEnumType.INTEGER)
+  public int dbValue() {
+    return 100 + ordinal();
+  }
+}