[fix] subview description override

 - do not write to input description
 - force parent window even if description has a different one

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Add compilation info to README file

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Add more extensive build system documentation

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>