add `forcenofocus` prop

[phonetic112]

Describe your PR, what does it fix/add?

adds forcenofocus window prop.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

probably a better way to impl this, but it works

Is it ready for merging, or does it need work?

ready, need wiki mr

[vaxerski]

why not just move m_bNoFocus to SWindowAdditionalConfigData and make it an overridable var

[phonetic112]

Done