Fix shadowed variable 'facets'
Fix gitignore for sln/vcproj

 - The DevStudio/msvc build does not work for shared libraries (dll)
 - Fixed QhullFacet::PrintRidges to check hasNextRidge3d()
 - Cleaned up Qt project files
 - Fixed Makefile for shared libraries
 - Moved libqhull to libqhullstatic, as done in CMakeLists
 - Made libqhull a shared library
 - Restored /INCREMENTAL:NO since CONFIG -= incremental did not work
 - Added 'facets' argument to user_eg3.cpp

 - Added libqhullp, libqhullcpp, user_eg3, qhulltest to Makefile
 - Build: Removed -frtti from gcc build
 - Build: Comment out -Werror
 - Removed semicolon after extern "C" {...}
 - Renamed parameters, locals, and fields to avoid shadowing
 - Updated test programs for new location of bin/qhull
 - Removed unused QhullEvent/QhullLog