Installer followup

mazmazzrequested to merge
installer-followup into master
  • Check if administrator rights are required
  • Add INSTALL INSTRUCTIONS text file to root install folder in case the installer fails
  • Add failsafes to uninstaller file deletion: check if name is a folder, and check for illegal chars
  • Fixed parentheses breaking the installer by instead making exclamation marks do the breaking. Thanks Windows!

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