add keyword Set Selector Suffix

[tkopra]

Is your feature request related to a problem? Please describe.
Currently I need to separately add ">> visible=true" at the end of each selector, especially text selectors. This seems unnecessary repetitive work and also makes the test less clean.

Describe the solution you'd like
New keyword Set Selector Suffix. Similar to existing Set Selector Prefix.

Describe alternatives you've considered
More generic Set Config keyword to handle all similar configuration changes.