Environments Xmas rooms on snowy day

- Three types(bedroom/livingroom/diningroom) x 3presets(day/night/no lights).I added snow and fireplace effect built-in each asset.Assets' vars have no scene, no dependencies.licence:CCBYSA
- File [DP][Scene]Xmas_rooms_presets.var is a scene demo,I made a few simple presets to decorate the environment, including different skyboxes, fireworks and sounds for day and nigh.