Replace dynamic_cast by static_cast

Avoid segmentation fault
Add non const getters to Chunk
Add type characteristic to the biomes
Add tree generation
Merge branch 'application-base' of https://github.com/stevenremot/tlsd-prototype into application-base

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
Replace dynamic_cast by static_cast to avoid seg fault in AnimatedMeshSceneNode and CameraSceneNode
Merge branch 'application-base' of https://github.com/stevenremot/tlsd-prototype into application-base

Conflicts:
	src/Graphics/Render/AnimatedMeshSceneNode.cpp