Fix crash on nvidia linux
Separate lightshaft from sun
Rename variable + bugfix
Add libxrandr-dev in Ubuntu dependencies command example.
Merge pull request #1490 from fenicks/master

Add libxrandr-dev in Ubuntu dependencies command example.
Move creating rain to world class because now it doesn't depend on cameras.
Don't start rain sound too early
A bit better formatting in world status
Factorise a common interface to stkmeshscenenode/animatedmesh
Remove instancing
Increase instance buffer size
Gather object in instanced calls