batch installer now uses version comparison instead of checking if
specific updates are installed, so I won't have to keep updating the
hotfix id list everytime a new update comes out. this will also make the
installation process much faster.
- moved logging to file (#66)
- added preview updates KB4022168 and KB4022720 to supported updates in
installer script (untested)
- made adjustments to wix project (still WIP)
- moved shared globals to util.h
