Added "#pragma unmanaged" in win_delay_load_hook.cc to support clr

PR-URL: #1819
Reviewed-By: João Reis <reis@janeasystems.com>

Make Python 3 compatiblity changes so the code works in both Python 2
and Python 3.  Especially, make changes required because the compiler
module was removed in Python 3 in favor of the ast module that exists
in both Python 2 and Python 3.

PR-URL: #1820
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rod Vagg <r@va.gg>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

This change supports access to StringIO on both Python 2 and Python 3

PR-URL: #1836
Reviewed-By: Rod Vagg <r@va.gg>
Reviewed-By: João Reis <reis@janeasystems.com>

Refs: #1846
PR-URL: #1843
Reviewed-By: João Reis <reis@janeasystems.com>

Fixes: #1826
PR-URL: #1843
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Rod Vagg <r@va.gg>
Reviewed-By: Matt Cowley <me@mattcowley.co.uk>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

PR-URL: #1843
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Rod Vagg <r@va.gg>
Reviewed-By: Matt Cowley <me@mattcowley.co.uk>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

Fixes: #1782
PR-URL: #1817
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Rod Vagg <r@va.gg>

Used scoped disabling of managed code handling to ensure no other
files get affected.

PR-URL: #1852
Reviewed-By: João Reis <reis@janeasystems.com>

PR-URL: #1860
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Rod Vagg <r@va.gg>

PR-URL: #1853
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

PR-URL: #1858
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Rod Vagg <r@va.gg>

(accepted with minor modifications by rvagg)

PR-URL: #1802
Reviewed-By: Rod Vagg <rod@vagg.org>

Fixes: #1834
PR-URL: #1835

PR-URL: #1863
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

PR-URL: #1888
Reviewed-By: Rod Vagg <rod@vagg.org>

Fixes: #1887
PR-URL: #1889
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

PR-URL: #1884
Reviewed-By: Rod Vagg <rod@vagg.org>

PR-URL: #1890
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

PR-URL: #1894
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>

…1000"

Ref: nodejs/node-addon-api#445 (comment)
PR-URL: #1895
Reviewed-By: Rod Vagg <rod@vagg.org>

PR-URL: #1893