Add XML support to NSE

[Duarte Silva <duartejcsilva () gmail com>]

Hi,

The following set of patches add XML support to NSE by using Expat. To
make the code review easier I have broken the changes in three
separated files.

nse-xml-libexpat.patch - Add all the Expat source/header library files
and the Visual Studio solution file
nse-xml-solchanges.patch - Changes to Visual Studio nmap.sln and
nmap.vcproj files
nse-xml-support.patch - Files that make the bridge between NSE and Expat

Note that I only have made changes to the Windows build environment.
Because at the moment I don't have a way to test it in Linux.

Dummy usage example follows.

function startelement(parser, name, atts)
        print(name)

        for key, value in pairs(atts) do
                print(key, value)
        end
end

function endelement(parser, name)
        print(name)
end

action = function(host, port)
        local callbacks = {
                start_element = startelement,
                end_element = endelement,
        }

        local p = expat.new(callbacks)
        p:parse("<first><second property=\"test\"></second></first>")
        p:close()
end


Waiting for feedback,
Duarte

Attachment: nse-xml-libexpat.patch
Description:

Attachment: nse-xml-solchanges.patch
Description:

Attachment: nse-xml-support.patch
Description:

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