update-perl-modules: Do not install Win32::API anymore

Now that we can set the console window icon from within the shell via
escapes code we do not need this anymore to call SetConsoleIcon from Perl.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Git Bash: Do not set the LOGIN_DIR environment variable anymore

Ever since bf025d5 we do not need to explicitly set the login directory
anymore as it is never changed from the current working directory.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Git Bash: Replace with a wrapper around msys.bat that hides the cmd window

See http://superuser.com/a/140077/136835.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
/etc/profile: Set the console window title separately from the prompt

This simplifies customizing the prompt.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
installer: Simpify the start menu icons as these can launch VBS directly

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>