Tacoma - Convert crop overseer field planting to json

[haveric]

Summary

Infrastructure "Tacoma - Convert crop overseer field planting to json"

Purpose of change

• Jsonify purchase and upgrade
• Move field purchase/upgrade out of the companion missions. Use normal conversation instead.
• Convert legacy cash to merch
  • Validate liquidate price: int merch_amount = ( number_plants * tmp.price( true ) - number_plots * 2.5 ) / 250;
• Create a bigger field and path to convert
  • Figure out how to delete the seeds after clearing old plants

Describe the solution

Remove legacy talk functions. Move to json

Describe alternatives you've considered

• Leave existing small field
• Create multiple field sizes (that possibly connect)

Testing

Loaded several games before the crop overseer existed as well as after planting the field and building the fence. Tested that everything works in chat.

Additional context

Ported changes from #55690