Iss build improvements

Due the dependency on 3rd party software that sometimes does not have
the proper Windows support, the Windows build is a little tricky. Those 
dependencies are crucial to the correct build and to provide all features of
ModSecurity, some of those 3rd party softwares are listed bellow:

 - Apache
 - Curl
 - Libxml2
 - Lua
 - Pcre
 - Zlib

In order to make a that build process less time consuming, a set of scripts were
created/updated to allow the build of the entire dependencies to be performed
from the console. By bulding the dependencies it is possible to compile the
ModSecurity straight on Visual Studio, there is a solution on the iis sub-folder.
It is also possible do compile ModSecurty using a command line tool that will
be later used on a CI. 

A new installer was created, now using Wix since it is free and do not relay on 
specifics versions of Visual Studio. There is a batch script to generate the msi,
as well.

Some cleanup was also made in the repository by removing unused stuff.