Client: viewmodel: weapon sway and quake viewmodelpos (also added to models settings)

[denz8028]

implemented quake-styled viewmodelpos and weapon sway, added to settings

[rtxa]

Not sure how the feature works (Maybe a video would be helpful) , but all I can say is that the formatting changes (whitespace, line breaks, etc.) are obscuring the core logic., I suggest removing those, so the reviewer can focus on the real changes and with that, you increase the odds of getting your PR merged.