Fix typos

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Update TODO

Signed-off-by: Stefan Weil <sw@weilnetz.de>
uvnc: Remove old code which is no longer used

Users who want to create their own winvnc-palma.exe can unzip one of the
available executables, for example theme/ub-mannheim/ic/winvnc-palma.exe.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Update old test code

The server which was used in this code is no longer available.

Signed-off-by: Stefan Weil <sw@weilnetz.de>