Fix for VGV's layer transparency control
Updated RBV library (fix for removing invalid objects from xtk)

Fixes #25
Merge branch 'master' of https://github.com/v-manip/WebClient-Framework
Added 'tilt' feature, accessble via the keys '1','2' and '3'
Merge branch 'master' of github.com:v-manip/WebClient-Framework into multiconfig