Icon is now loaded using an absolute path.

Also removed the setting of the AppUserModelID since it caused problems
with the windows 7 "pin this program to taskbar" function. Icons seem to
still work though.
Updated .gitignore to include sublime text files
Build options are now correctly set.

Before the build options were set but overwritten afterwards.
You can now use msi packages to upgrade the software (thanks to
upgrade_code).