[win32] Rebrand win32 BuildSetup and installer files

This "unifies" the builder/installer and easier to re-brand for Windows

To-do:
1. VisualStudio files have the Kodi.exe/.pdb hardcoded. Possibly we could just name those .exe/.pdb files "Application.ext" and rename them in the BuildSetup.exe to "AppName.ext"?

2. AppName/etc.. needs to be set in BuildSetup.bat and buildpvraddons.bat  Would be nicer to also have it reading from version.txt

3. Installer needs to properly handle the older installs. Need to further investigate this. Should we move the old install and userdata folder as well?

4. Rename "XBMC for Windows.nsi"

5. Probably something I forgot.. :)