A last upgrade for cultivator

[pipo.p]

After linen technology is unlocked in the plains, the cultivator (farming tool) could benefit from a last upgrade, adding a functionality to its menu: a "sowing rope".

It would work as follows:

1. Select Sowing rope in tools'menu;
2. Activate tool [E] at a suitable spot on the ground;
3. Move away from this initial spot, while a blue wooden rod and linen thread unfold (like building footprint);
4. Activate tool again [E] to set up the seedling rope, that is two wooden rods joined by a linen thread with knots to materialize spacings (this furniture doesn't hinder sowing);
5. Use hammer [middle button] to deconstruct the furniture.

No autosnapping feature would be included. This upgrade is inspired by farming grid mods, but is more integrated to Valheim environment. It would be mostly useful for large (long) field, and less so for small patches.