Uncompyle6

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- Fixes in deparsing lambda expressions
- Improve table-semantics descriptions
- Document hacky customize arg count better (until we can remove it)
- Update to use `xdis` 3.7.0 or greater

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- Use `xdis` 3.6.0 or greater now
- Small semantic table cleanups
- Python 3.4's terms a little names better
- Slightly more Python 3.7, but still failing a lot
- Cross Python 2/3 compatibility with annotation arguments

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- Skeletal support for Python 3.7

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* scanner and parser now allow 3-part version string look ups,
e.g. 2.7.1 We allow a float here, but if passed a string like '2.7'. or
* unpin 3.5.1. `xdis` 3.5.4 has been release and fixes the problems we had. Use that.
* some routines here moved to `xdis`. Use the `xdis` version
* `README.rst`: Link typo Name is _trepan2_ now not _trepan_
* xdis-forced change adjust for `COMPARE_OP` "is-not" in
semantic routines. We need "is not".
* Some PyPy tolerance in validate testing.
* Some pyston tolerance

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Very minor changes

- RsT doc fixes and updates
- use newer `xdis`, but not too new; 3.5.2 breaks uncompyle6
- use `xdis` opcode sets
- `xdis` "exception match" is now "exception-match"

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- Start supporting Pypy 3.5 (5.7.1-beta)
- use `xdis` 3.5.0's opcode sets and require `xdis` 3.5.0
- Correct some Python 2.4-2.6 loop detection
- guard against badly formatted bytecode