This PR adds in the autogenerated tests made for ImageJ Ops by @awalter17, massaged to work on ImageJ Ops2. This PR also massages/eliminates some create Ops to this end, to try and coalesce all Ops under the singular create namespace.

Points of discussion for the reviewers:

• These tests call the Ops as functions, but the Ops are written as Computer.Arity1s (this is slick for whole-image conversion). Unfortunately, for single-type conversion, though, this is tricky to match - you can't write ops.unary("convert.float64").input(myByte).apply(), because adaptation will fail*. As a result I've added .outType calls, however I think it looks unnecessarily clunky. The only other alternative I could think of, though, would be to have both a Computer and a Function implementation for all convert Ops, which defeats the purpose of adaptation ☹️
• Note that the first commit will fail the build because I did not solve the matching problems in the test until the second commit - we should squash the two commits before merging.

* fails because the standard Function --> Computers.Arity1 adaptors look for either a Function<ByteType, Object> or a Producer<Object>, which in the former case fails because a matched dependency makes the adaptation fail, and in the latter fails because there are multiple matches.

Closes scijava/scijava#112