Added

• /structuregrabber. Client-side command that takes two corners the way /fill does and writes the region between them to a structure .snbt file, linked in chat when it lands.
  • Corners can be set one at a time with pos1, pos2, grab and clear, instead of naming both in one go.
  • In single player the grab reads the hosted world, so block entities are complete and chunks outside render distance load on demand.
• Config for the output folder, whether entities and air are saved, and the largest region a grab may cover.