Option to set multiple entries as list instead of overriding for Konfiger

[Thecarisma]

E.g. in the sample ini file

extension=gd2
extension=gettext
extension=gmp
extension=intl
extension=imap

Option to process this as

The last one override early entries

extention=imap

Or as list

extention=gd2,gettext,gmp,into,imap
// then with getList("extention")
return extention.split(',')

Option should be

.overrideDupplicateKeys()

default reports as a list.