Add option to New Groovy Project wizard for compiler config script

Filling in name (and project-relative path) would create the script in the proper location with the following stub code:

withConfig(configuration) {
  |
}

Project preference linking the config script to the builder would be set. And the destination would be confirmed to not be within a project source folder.

Supporting DSLD could be added to org.codehaus.groovy2x/plugin_dsld_support/dsld/. Here is some partial descriptor code:

def configBlock = { -> enclosingCall(name('withConfig') & hasArgument('configuration')) & inClosure() & isThisType() }

contribute(configBlock()) {
  provider = '{@link org.codehaus.groovy.control.customizers.builder.CompilerCustomizationBuilder CompilerCustomizationBuilder}'

  method(name:'imports', type:void, params:[block:Closure])
  method(name:'ast', type:void, params:[xform:'Class<? extends Annotation>'], optionalParams:[attributes:Map])
  method(name:'customizers', type:void, params:[customizers:'Collection<org.codehaus.groovy.control.customizers.CompilationCustomizer>'])
  method(name:'inline', type:void, params:[code:Closure], namedParams:[phase:String], optionalParams:[superClass:Class, interfaces:Class[]], provider:'org.codehaus.groovy.control.customizers.builder.InlinedASTCustomizerFactory')

  method  name: 'source',
          type: void,
          params: [block: Closure],
          optionalParams: [
            basename: String,
            basenames: String[],
            basenameValidator: 'Closure<Boolean>', //params:[String]
            extension: String,
            extensions: String[],
            extensionValidator: 'Closure<Boolean>', //params:[String]
            unitValidator: 'Closure<Boolean>', //params:[SourceUnit]
            classValidator: 'Closure<Boolean>' //params:[ClassNode]
          ]
  //org.codehaus.groovy.control.customizers.builder.SourceAwareCustomizerFactory
  //secureAst org.codehaus.groovy.control.customizers.builder.SecureASTCustomizerFactory
}

contribute(configBlock() & enclosingCallName('imports')) {
  provider = '{@link org.codehaus.groovy.control.customizers.builder.ImportCustomizerFactory ImportCustomizerFactory}'
  setDelegateType(  'org.codehaus.groovy.control.customizers.builder.ImportCustomizerFactory.ImportHelper')
}

contribute(configBlock() & enclosingCallName('ast')) {
  provider = '{@link org.codehaus.groovy.control.customizers.builder.ASTTransformationCustomizerFactory ASTTransformationCustomizerFactory}'
  setDelegateType(  'org.codehaus.groovy.control.customizers.ASTTransformationCustomizer')
}

Start at the New Groovy Project wizard and inspect how project preferences link scripts to the builder. Review org.codehaus.groovy2x/plugin_dsld_support/dsld/ and the partial descriptor in the issue. Done means the wizard creates the requested script with the stub, links it to the builder, rejects project source-folder destinations, and optionally provides DSLD support.