Add "regen-*" equivalent projects for Windows builds

[tonybaloney]

BPO	36500
Nosy	@brettcannon, @zooba, @tonybaloney, @pablogsal, @tonybaloney
PRs	bpo-36500: Enable Windows users to regen grammar, opcodes, tokens and symbols from Visual Studio #12654 bpo-36500: Simplify PCbuild/build.bat and prevent path separator changing in comments #17644

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/tonybaloney'
closed_at = <Date 2019-12-17.22:14:36.854>
created_at = <Date 2019-04-02.00:13:34.351>
labels = ['build', '3.9']
title = 'Add "regen-*" equivalent projects for Windows builds'
updated_at = <Date 2019-12-17.22:14:36.852>
user = 'https://github.com/tonybaloney'

bugs.python.org fields:

activity = <Date 2019-12-17.22:14:36.852>
actor = 'steve.dower'
assignee = 'anthonypjshaw'
closed = True
closed_date = <Date 2019-12-17.22:14:36.854>
closer = 'steve.dower'
components = ['Build']
creation = <Date 2019-04-02.00:13:34.351>
creator = 'anthony shaw'
dependencies = []
files = []
hgrepos = []
issue_num = 36500
keywords = ['patch']
message_count = 5.0
messages = ['339309', '339310', '358580', '358586', '358592']
nosy_count = 5.0
nosy_names = ['brett.cannon', 'steve.dower', 'anthonypjshaw', 'pablogsal', 'anthony shaw']
pr_nums = ['12654', '17644']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36500'
versions = ['Python 3.9']

[tonybaloney]

Now that pgen is written in Python, it'd be useful for Windows users to be able to rebuild grammar and tokens into the parser table.

The current hook (make regen-grammar) is built into the Makefile.

Add support for VS2017+ vcxproj files to call the script directly

[tonybaloney]

Project now also does:
regen-symbol (regenerate Lib/symbol.py)
and regen-keyword (regenerate Lib/keyword.py)

[zooba]

New changeset 9e36589 by Steve Dower (Anthony Shaw) in branch 'master':
bpo-36500: Add --regen option to PCbuild/build.bat so Windows users can regen grammar, opcodes, tokens and symbols (GH-12654)
9e36589

[zooba]

Adding just a couple of minor touch-ups in PR 17644, but otherwise thanks Anthony!

[zooba]

New changeset a9d0a6a by Steve Dower in branch 'master':
bpo-36500: Simplify PCbuild/build.bat and prevent path separator changing in comments (GH-17644)
a9d0a6a