Use only Everness nodes for schematics

[Juraj Vajda]

Use only Everness nodes for schematics so schematic structures can be agnostic from hard mod dependencies (default).

[Péntek Imre]

as long as you’re using blocks which are provided by modules you’re explicitly depending on (as stated by depends=) you’re fine. Also, your schematic format is pretty close to be able to handle optional dependencies as well

[Juraj Vajda]

Addressed in https://bitbucket.org/minetest_gamers/everness/commits/7712ae2cf10c5fdc3af56d2701b480bbbfc228cd