Automatic generation of farmlands
* Removed placeables. * GDM schema. * Adding farmlands. * Linter updates. * Advanced settings for farmland margin. * Adding farmlands to XML. * Linter updates. * Docs update. * README update.
* Removed placeables. * GDM schema. * Adding farmlands. * Linter updates. * Advanced settings for farmland margin. * Adding farmlands to XML. * Linter updates. * Docs update. * README update.