feature: add get zoom/focus, discrete set zoom/focus commands, and get/set autofocus#89

Benehiko merged 4 commits intoReolinkCameraAPI:masterReolinkCameraAPI/reolinkapipy:masterfrom

stevebriskin:add_discrete_ptz_commandsstevebriskin/reolinkapipy:add_discrete_ptz_commandsCopy head branch name to clipboard