feat: add place any blocks and commands for enviromnents

[snowyu]

feat: add place any blocks and commands for enviromnents: override_day_night_ratio, set_clouds, set_stars, set_sun, set_moon. see #3

• Should not change the player privs. It should be a command to do this.
• Should not change the enviromnents. The enviromnents commands added.
• Should not change the player's inventory. It should be a command to do this.

[nlewo]

I would also be interested in using any blocks and not only those hardcoded in this mod!