opencl: Add recommended changes

Usage of LIBFREENECT2_WITH_PROFILING.

Changed CHECK_CL macros.

OpenCLAllocator can now be used for input and output buffers.

OpenCLFrame now uses OpenCLBuffer from allocator.

IMAGE_SIZE and LUT_SIZE as static const.

Added Allocators for input and output buffers.

Moved allocate_opencl to top.

Added good() method.

Author: Thiemo Wiedemeyer

include/internal/libfreenect2/depth_packet_processor.h

@@ -175,7 +175,9 @@ class OpenCLDepthPacketProcessor : public DepthPacketProcessor
   virtual void loadXZTables(const float *xtable, const float *ztable);
   virtual void loadLookupTable(const short *lut);
 
+  virtual bool good();
   virtual const char *name() { return "OpenCL"; }
+
   virtual void process(const DepthPacket &packet);
 protected:
   virtual Allocator *getAllocator();