Draft: envmanager: Replace convergentwindows script with kwin rules

Replace the convergentwindows KWin script with KWin rules to ensure windows are maximized and have no window border (and toggle off for docked mode). KWin rules work immediately at window creation, which is more efficient than listening to window creation events and manually changing properties on them. The KWin rules to enforce maximization also likely fixes many issues with windows getting unmaximized due to various causes.