removed light demo specific things.

Signed-off-by: Peter Mårtensson <veritas.is.me@gmail.com>
Terrain performance tests.

Signed-off-by: Peter Mårtensson <veritas.is.me@gmail.com>
Switched to pure deferred rendering.

Signed-off-by: Peter Mårtensson <veritas.is.me@gmail.com>