Add PhysicsEffects to Extras. The build is only tested on Windows and Android.

The Android/NEON optimized version of Physics Effects is thanks to Graham Rhodes and Anthony Hamilton, See Issue 587

Extras/PhysicsEffects/src/low_level/CMakeLists.txt

@@ -0,0 +1,29 @@
+INCLUDE_DIRECTORIES( ${PHYSICS_EFFECTS_SOURCE_DIR}/include  )
+
+SET(PfxLowLevel_SRCS
+					broadphase/pfx_broadphase_single.cpp
+					collision/pfx_batched_ray_cast_single.cpp
+					collision/pfx_collision_detection_single.cpp
+					collision/pfx_detect_collision_func.cpp
+					collision/pfx_intersect_ray_func.cpp
+					collision/pfx_island_generation.cpp
+					collision/pfx_ray_cast.cpp
+					collision/pfx_refresh_contacts_single.cpp
+					solver/pfx_constraint_solver_single.cpp
+					solver/pfx_joint_constraint_func.cpp
+					solver/pfx_update_rigid_states_single.cpp
+					sort/pfx_parallel_sort_single.cpp
+)
+
+SET(PfxLowLevel_HDRS
+					collision/pfx_detect_collision_func.h
+					collision/pfx_intersect_ray_func.h
+)
+
+
+
+
+ADD_LIBRARY(PfxLowLevel ${PfxLowLevel_SRCS} ${PfxLowLevel_HDRS})
+
+SET_TARGET_PROPERTIES(PfxLowLevel PROPERTIES VERSION ${BULLET_VERSION})
+SET_TARGET_PROPERTIES(PfxLowLevel PROPERTIES SOVERSION ${BULLET_VERSION})