v0.3.0

First Post-LD version, or v0.3.0 as I call it:

• added keyboard bindings for building construction
• modified production values, rebalanced production usage and outputs (though they’re definitely not final)
• added “Min” and “Max” buttons to colonist request for quicker input
• colonists without a job now get auto-assigned to free jobs:
  • newly arrived colonists will try to find a job within few seconds
  • colonists manually unassigned from a job will seek a new one if not reassigned for a full cycle