Add function to reset to cached worldSlice

[avdstaaij]

Using editor.worldSliceDecay, it should be possible to reset the world to the cached worldSlice, effectively "undoing" your generator if you only load the worldSlice once. A helper function for this might be useful.

[avdstaaij]

Here's an implementation I previously posted on Discord:

# buffering not necessary, but improves performance
editor = Editor(buffering=True)
buildArea = editor.getBuildArea()

# Load a WorldSlice
editor.loadWorldSlice(buildArea.toRect(), cache=True)

# <Your building code here>

editor.flushBuffer()
input("Press enter to continue...")

# Reset the blocks that have changed
for pos in np.argwhere(editor.worldSliceDecay):
    globalPos = ivec3(*pos) + editor.worldSlice.box.offset
    editor.placeBlockGlobal(globalPos, editor.worldSlice.getBlockGlobal(globalPos))

There could be a context manager that just does this, but there is the significant caveat/limitation that it would assume that the user does not call Editor.loadWorldSlice or Editor.updateWorldSlice in their building code. Some thought still needs to be put into this.