Class selector dialog

## Class selector dialog |
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| The custom class selection dialog is shown when clicking on the [...] chooser buttons next to the custom action fields in the custom code tab, the Add action (enterprise edition only) in the Installer features tab or the Advanced tasks tab of the Installer step. The custom class selector shows all classes derived from `com.install4j.api.InstallAction` for pre-install and post-install actions. `com.install4j.api.UninstallAction` for pre-uninstall and post-uninstall actions. `com.install4j.api.CustomScreen` for custom screens. `com.install4j.api.StartupHandler` for the "startup handler" advanced task. `com.install4j.api.DirectoryValidator` for the "directory validator" advanced task. `com.install4j.api.InstallationHandler` for the "installation handler" advanced task. Please see the API description for a detailed explanation of these base classes. Please choose a class from the list and click on [Ok] or double-click on the selected class. If you do not want to make a choice, please click on [Cancel].