* Start splitting type_prop.cpp (just a few for now, to get feedback on general pattern)

* Split out some more type_prop stuff

* A bunch more

* Move one test out of type_prop into build_graph

* Split Reverse from ReverseSequence (oops), and fix a typo I noticed in dyn_reshape.cpp

* fix EOF newline

* Style.

* Add newline at eof.