FS19 - Stubble Cultivator V1.0

The mod is a global specialization added to any tool implementing Cultivator or SowingMachine spec.
When activated, Stubble Cultivator will let chopped straw on the field when using cultivator to distinguish stubble cultivator vs. standard cultivator.
Similarly, by activating the mod on a seeder, chopped straw remains after sowing.

Authors: yumi