find replace Ref with other function types such as FnImportValue when extending a template

[Guslington]

What i would like to be able to do is extend a template and find and replace where a Ref is defined with the extended template and replace it with a FnImportValue.

Example cfhighlander template

CfhighlanderTemplate do
  Name 'service'

  Parameters do
    ComponentParam 'ServiceTag'
  end

  Extends 'ecs-service@latest' do
    replace name: 'EcsCluster', value: FnImportValue(FnSub("${EnvironmentName}-ECSCluster"))
    replace name: 'VPCId', value: FnImportValue(FnSub("${EnvironmentName}-VPC"))
    replace name: 'Listener', value: FnImportValue(FnSub("${EnvironmentName}-httpsListener"))
    parameter name: 'ServiceTag', value: Ref('ServiceTag')
  end

end

[toshke]

@Guslington Some of the functionality done on #65 could be used here.