Trees shadow parameters use actual debug settings

Use RenderDeferredTreeShadowOffset, RenderDeferredTreeShadowBias,
RenderDeferredSpotShadowOffset and RenderDeferredSpotShadowBias
in place of hard coded values.
Merge branch 'master' of github.com:singularity-viewer/SingularityViewer
Merge branch 'master' of github.com:singularity-viewer/SingularityViewer
Allow species selection for plant creation

Fixes hardcoded "Random" string for translation of this new combobox.
Merge branch 'master' of https://github.com/slabua/SingularityViewer
Harden agains network packet overruns

Patch by NickyD from Firestorm