Added GNU GPL license text to source files

Added GNU GPL license text to all .cs source files except those
created/updated automatically by Visual Studio tools.
Replace VS setup project with Install Shield

Replace the visual studio setup project with an Install Shield Limited
Edition alternative.
Updated Visual Studio solution

Updated Visual Studio solution to reflect replacement of VS setup
project with Install Shield Limited Edition project.
Ignore Visual Studio .vs10x extensions in GutHub

Ignore Visual Studio CodeSMART 10 and VS10X Extensions in GutHub.
Updated ReadMe files

Updated ReadMe files on GitHub, added during installation and appearing
in install dialog.
Renamed licence.txt to License.txt

Corrected the spelling on the the license file.