more cleanups & docs

org/apt-notes.org

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+#+title: Apt Notes
+* ideas
+** state
+state is a global hashmap.
+top keys are references, which uniquely identify an idea.
+top values are the content of the ideas.
+** fields
+ideas have stuff in _meta field
+notably [:_meta :_properties] and [:meta :_reference]
+there is also _parent.
+*** TODO _parent and _meta need getters
+** uid-of
+uses property system to deref ideas
+should be used rather than prtc/value
+
+* properties
+** in state
+state has a top-level _property key
+below that is a hierarchical map of the different property keys (like :foo into :bar into :baz) that finally has a :_node key, which is a set of all idea references for that property