add msg macro for generating unique integer types
improve EntityMacro
make sure EntitySystem is initialized
more strict EntitySystem.lookup()
lookup entity by type: remove inheritance chain for now
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minor cleanup
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make type public (_type => type)
revise scene package (now called screen as scene is too generic)
remove old entity system (sys package)
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merge _bits into type field
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allow optional message data
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import EntitySystem in ES
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don't init entity system twice
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add entity iterator helper class
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cleanup
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don't set inner id to -1 on removal; instead allow to recover inner id by just setting msb=1
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print message sequence with -D verbose
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improve ObservableEntity
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add Entity.getChildAt()
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cleanup
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add Entity.reveal[Siblings, Ancestors, Descendants]()
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fix Entity.ancestorByType()