* Fix a segmentation fault on some samples when the memory type is 3 (OUT_SURFACE_MEM_NOT_MAPPED) and attempting to save the output (which is not supported)
* update the videoDecodeMultiFiles sample
* update the readme for videoDecodeMultiFiles
* add comments
* use OUT_SURFACE_MEM_NOT_MAPPED instead of integer number 3
* * rocDecode: Added a command option "-md5_check" to compare the MD5 of the decoded YUV to the reference MD5. This ficilitates decoder conformance test automation.
* * rocDecode/HEVC: Changed file and string operation from C code to C++ code.
* * rocDecode/HEVC: Updated README.md for videoDecode sample.