Fix for #662
Some small changes to block definitions
Implemented "ghost" console command to fly and move through walls.
Removed a stray glPopMatrix()
Fixed an issue with the world renderer trying to remove unloaded chunks.
Ported climbing and climabable block support.
Fixed the Land sound effect (was stereo, sfx must be mono)
Quick fix for waving blocks causing gaps in the world.
Fixes for some block shapes
Shadows for labels in Controls config screen
Bind button for Hide HUD button.