Change all sfml_zen_bar thingies in sfml_about_screen

[RafayelGardishyan]

Is your feature request related to a problem? Please describe. In the past we used sfml_zen bar components in every class apart. Now it's possible to do that with a new class called sfml_zen_bar

Describe the solution you'd like In sfml_about_screen change all zen_bar & zen_ind occurencies to the new class

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.

[martprenger]

pls give some documentation, thank you, really appreciate it - DynCoder