更新整体移动的功能
选中地基可以整体移动地基上的所有物品
左Ctrl+鼠标左键拖动可以选中范围内的所有物品，进行整体移动
修复若干bug
Updated the overall movement functionality.
Selecting the foundation now allows moving all items on it as a whole.
Use Left Ctrl + Left-click and drag to select and move all items within a range.
Fix several bugs