all: rename `FCL_REAL` to `CoalScalar`

doc/gjk.py

doc/mesh-mesh-collision-call.dot

doc/shape-mesh-collision-call.dot

doc/shape-shape-collision-call.dot

include/coal/BV/AABB.h

include/coal/BV/BV.h

include/coal/BV/BV_node.h

include/coal/BV/OBB.h

include/coal/BV/OBBRSS.h

include/coal/BV/RSS.h

include/coal/BV/kDOP.h

include/coal/BV/kIOS.h

include/coal/BVH/BVH_model.h

include/coal/BVH/BVH_utility.h

include/coal/broadphase/broadphase_SSaP.h

include/coal/broadphase/broadphase_SaP.h

include/coal/broadphase/broadphase_callbacks.h

...coal/broadphase/broadphase_continuous_collision_manager.h

include/coal/broadphase/broadphase_dynamic_AABB_tree-inl.h

.../coal/broadphase/broadphase_dynamic_AABB_tree_array-inl.h