MSI: Add autostart and homedir properties

* src/make-msi.pl: Add AUTOSTART and HOMEDIR.

This enables users of the package to autostart kleopatra
into the systray so that operations later on are quick.

HOMEDIR allows admins to customize the home directory to
put it for example in a more restricted location.

For example:

msiexec /i GnuPG-VS-Desktop-3.1.17.1-Testorg.msi
    ALLUSERS=1 HOMEDIR=H:\gnupg AUTOSTART=true /norestart /quiet