Changelog:

0.8.0b0:

Breaking change: the BlockState constructor no longer takes properties as a single properties argument.
Each property must be supplied as its own keyword argument instead.
E.g. BlockState("minecraft:acacia_log", facing="west")
Added BlockState.with_properties() and BlockState.with_blockid() to create copies of block states
but with different ids and properties.
Added Region.filter() to allow for efficient block replacement.
Schematic palettes are now always optimized before saving