Additions

• Block count expression - gets the number of blocks in a region that match a certain mask or itemtype
• Expand/contract effect - expands or contracts a region in a given direction by a given amount. Also optionally can expand in the opposite direction
• Inset/outset effect - insets or outsets a region by a given amount. Can optionally only perform the operation vertically or horizontally

Other (pretty boring) stuff

• The RegionWrapper#getDistribution method now returns a map with String keys instead of BlockData
• Adds SimpleExpression as a target class in the EmptyAnnotationAdder

Full Changelog: 1.0.3...1.0.4