obs-qsv11: Enable QSV texture-based encoding

Enables a pipeline for texture-based encoding with QSV. Utilizes OBS
NV12 output for encode to avoid offloading them from GPU, which will
increase performance. The option to select old QSV pipeline still
remains and will fallback if new pipeline fails.

plugins/obs-qsv11/QSV_Encoder_Internal.h

@@ -70,6 +70,9 @@ public:
 	mfxStatus Encode(uint64_t ts, uint8_t *pDataY, uint8_t *pDataUV,
 			 uint32_t strideY, uint32_t strideUV,
 			 mfxBitstream **pBS);
+	mfxStatus Encode_tex(uint64_t ts, uint32_t tex_handle,
+			     uint64_t lock_key, uint64_t *next_key,
+			     mfxBitstream **pBS);
 	mfxStatus ClearData();
 	mfxStatus Reset(qsv_param_t *pParams);