Move ruby implementation in an own branch

[agaida]

To be honest - i guess the preferred implementation will be C++ - unfortunately we have no ruyby guys around

[hagabaka]

The Ruby version was an early prototype, so probably not much would be lost by deleting it. However, the ruby directory also contains a script which can parse an SDDM example configuration file and generate data/config-schema.json, which is basically the C++ application's model, and cpp/config-strings.qml, which enables the setting names and descriptions to be localized. This way the application can be semi-automatically updated when SDDM adds/removes settings. The script and supporting files are:

• ruby/make-config-schema
• ruby/parser/example-configuration-file.rb
• ruby/parser/ini-file.rb
• ruby/parser/setting-conversion.rb

[agaida]

Done - i renamed ruby to maint for now - we should keep the needed files intact