Make Laborers Silent

[YodasWs]

For the MVP, make Laborers a silent part of the game:

• They exist as they do now, taking up Housing and providing the necessary labor to make the Farms productive.
• Have them consume 0 Food and not worry about starving as long as their Food requirement is 0.
• Still make the Farms unproductive if their Laborer is somehow lost/killed (say by a random event).
• Need to add some visual indication when a Farm is missing a Laborer and unproductive.
• Add a pop-up or modal to notify the Player that they have an unproductive Farm and they can reactivate it by sending a Farmer Unit there.
• And let the Player decide a Farm is not worth reactivating and so we should stop telling them that their Farm(s) is/are unproductive.