Replace configuration via Map objects with Kotlin DSL / method.

[smidf]

For example from:

setAdditionalProperties(
    mutableMapOf(
            "templateEngine" to "mustache",
            "dateLibrary" to "string"
            ...
    )
)

to: Kotlin DSL / configure blocks

additionalProperties {
    templateEngine = MUSTACHE // enum instead of string
    dateLibrary = STRING // enum instead of string
    generateInfrastructure = false
    ...
}

or to: Methods

additionalProperties {
    setTemplateEngine(MUSTACHE /* enum instead of string */)
    setDateLibrary(STRING /* enum instead of string */)
    generateInfrastructure(false)
    ...
}

This can eliminate setup errors, is much more descriptive and gives the user an overview of the options offered.