[*] Updated build configuration
  - Updated to Tycho-0.18
  - Added feature.xml to license plug-in
  - Changed spec of encoding

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[Releng] Fixed license url for features

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>