vendored copy of pyparsing and appdirs contain invalid escapes

[mwhudson]

These can lead to warnings with python3.6:

(master)mwhudson@aeglos:/opt/opensource/setuptools$ find -name \*.py | xargs python3.6 -Wall -m py_compile
./pkg_resources/_vendor/appdirs.py:130: DeprecationWarning: invalid escape sequence \D
  """
./pkg_resources/_vendor/appdirs.py:235: DeprecationWarning: invalid escape sequence \P
  """
./pkg_resources/_vendor/pyparsing.py:147: DeprecationWarning: invalid escape sequence \d
  xmlcharref = Regex('&#\d+;')
./pkg_resources/_vendor/pyparsing.py:832: DeprecationWarning: invalid escape sequence \d
  """
./pkg_resources/_vendor/pyparsing.py:2736: DeprecationWarning: invalid escape sequence \d
  """
./pkg_resources/_vendor/pyparsing.py:2914: DeprecationWarning: invalid escape sequence \g
  ret = re.sub(self.escCharReplacePattern,"\g<1>",ret)

[FRidh]

Currently pyparsing==2.1.10 and appdirs==1.4.0 are used. appdirs==1.4.3 should solve the issue. I don't know about pyparsing, I think that one may be a bit riskier to upgrade as well due to API changes.

[hugovk]

This is a duplicate of #1426 (or that's a duplicate of this, but that has more up to date info).

#1450 should fix the PyParsing ones, and #1451 the appdirs ones.

[hugovk]

I think this can be closed, #1450 and #1451 have been merged.

[Avasam]

pyparsing is also no longer vendored anymore