Added support for parsing query strings from the URL as defined by
RFC-5092.

Should a command return untagged responses that contained no data then
the imap_matchresp() function would not detect them as valid responses,
as it wasn't taking the CRLF characters into account at the end of each
line.

Carrying on from commit 11025613 added VC11 project files which are
capable of supporting side-by-side compilation, 32-bit and 64-bit
builds as well as support for some of the third-party libraries curl
uses.

Carrying on from commit 11025613 added VC10 project files which are
capable of supporting side-by-side compilation, 32-bit and 64-bit
builds as well as support for some of the third-party libraries curl
uses.

Carrying on from commit 11025613, added VC9 project files which are
capable of supporting side-by-side compilation, 32-bit and 64-bit
builds as well as support for some of the third-party libraries curl
uses.

Given that we presently support "auth" and not "auth-int" or "auth-conf"
for native challenge-response messages, added client side validation of
the quality-of-protection options from the server's challenge message.

... the recent MSVC project files added by Steve Holme

Bug: http://curl.haxx.se/mail/lib-2014-04/0063.html
Reported-by: Jeroen Koekkoek

To avoid urldata.h being included from the header file or that the
source file has the correct include order as highlighted by one of
the auto builds recently.

warning: no previous prototype for 'Curl_sasl_create_digest_md5_message'

warning: 'sasl_digest_get_key_value' defined but not used

* Added comments to SSPI NTLM message generation
* Added comments to native DIGEST-MD5 code
* Removed redundant identity pointer

When CURL_DISABLE_CRYPTO_AUTH is defined the DIGEST-MD5 code should not
be included, regardless of whether USE__WINDOWS_SSPI is defined or not.
This is indicated by the definition of USE_HTTP_NEGOTIATE and USE_NTLM
in curl_setup.h.

* Added information regarding the February 2003 Platform SDK for VC6
* Updated the introduction to be similar to the IDE projects README

Added a more thorough version of the VC8 project files that exist in
the "vs" folder with the intention to add support for other versions of
Visual Studio. These files support side-by-side compilation, 32-bit and
64-bit builds as well as support for some of the third-party libraries
curl uses.

And clarify for curl that --proxy-header now must be used for headers
that are meant for a proxy, and they will not be included if the request
is not for a proxy.