Import and render tree models.

Trees are loaded from the new trees.blend using assimp. Tree objects are
then received from the server and rendered on the given terrain
locations.

Each chunk now holds a list of objects and coordinates, which can be
used to easily add other models as well.

Also moded the GLSL fog code to its own shader which can be linked in
different programs.

1 files changed, 0 insertions, 0 deletions

diff --git a/common b/common
-Subproject ff7f9de199213ea6d4832c0b91f2a96f5edc6bb
+Subproject 6e746716d6a5c72fbd42539c6d5d92da8830cb9