Building Blueprints

Adds a blueprint management system for placeable buildings to build mode. While positioning a building, press Left Shift + B to save it as a blueprint. Blueprints are stored in buildingBlueprints.xml within the savegame and restored when the save is loaded.

• Saved blueprints display their adjusted area with a green outline in both selection and demolition mode. Mouse interactions are accepted only within this outlined area.
• In normal selection mode, clicking inside the area opens the menu with Build, Delete, and Back. Press B to build and C to delete. In demolition mode, clicking removes the blueprint.
• Before a purchase, the mod checks the building location, terrain deformation, current terraforming costs, available funds, and possible collisions. Costs are recalculated whenever a blueprint is selected.
• An accepted blueprint is removed once the purchase price has been deducted from the farm account. Rejected or blocked purchases leave the blueprint in place.
• For animal barns with adjustable pasture fences, the standard workflow for adjusting, validating, and finalizing the fence is supported.
• The detail window displays the total cost of all blueprints, including building prices and saved terrain-adjustment costs. Opening it only performs validation and reports the result in a status line without purchasing anything or modifying the terrain.