Move the MC routines to the common library

Use the decoder versions of the functions (which are capable
of handling widths 4/8/16 for luma, not only 16 as in the
encoder). By using the more generic versions, there may be a small
performance loss since the functions need to check the width
in every call. Actual measurements show that the actual change is
very small (and the shared routines turn out to actually be faster
than the existing ones in ARM NEON setups).

codec/decoder/core/inc/decoder_context.h

@@ -55,6 +55,7 @@
 #include "crt_util_safe_x.h"
 #include "mb_cache.h"
 #include "expand_pic.h"
+#include "mc.h"
 
 namespace WelsDec {
 #define MAX_PRED_MODE_ID_I16x16  3
@@ -142,13 +143,6 @@ uint8_t				uiLongRefCount[LIST_A];	// dependend on ref pic module
 int32_t				iMaxLongTermFrameIdx;
 } SRefPic, *PRefPic;
 
-typedef void (*PWelsMcFunc) (const uint8_t* pSrc, int32_t iSrcStride, uint8_t* pDst, int32_t iDstStride,
-                             int16_t iMvX, int16_t iMvY, int32_t iWidth, int32_t iHeight);
-typedef struct TagMcFunc {
-PWelsMcFunc pMcLumaFunc;
-PWelsMcFunc pMcChromaFunc;
-} SMcFunc;
-
 typedef void (*PCopyFunc) (uint8_t* pDst, int32_t iStrideD, uint8_t* pSrc, int32_t iStrideS);
 typedef struct TagCopyFunc {
 PCopyFunc pCopyLumaFunc;