improved movment
fix delta_t calculation in game.d
Merge pull request #7 from clonejo/fix-delta-t

fix delta_t calculation in game.d
using short as uv type
fixed uvs
improved food plants?
removed normals from the vbo for now
light is passed to the shader
huge and strange performance improvment in the fragment shader
fixed #8 (make alt+tab etc. work)
tried to track down the "Key was smaller than nothing!  Weird key!" error. Can't be reproduced either with debugging output nor with using mc3p proxy
commented debugging code away
forgot assert(false)...
fixed the light values passed to the shader
working frustum culling (+ updated submodules)
implemented cacti
implemented rails
implemented ladders (+added .vertices_.rails.d)
implemented vines
using leave color for vines