Split Grid Nodes into Essential and Non-Essential

[shartte]

To avoid the explosion of grids that do not actually have any function, we should not create grids for nodes that do not actually have services if they're on their own in the grid.

This should prevent crafting cube multiblocks from bogging down servers when they're broken.

Example:

Building a maximum size crafting CPU (16x16x16) and removing one block might create roughly 4000 grids since all of the blocks devolve into their own individual grids.