code cleanup - use google style for videodecode sample and RocVideoDecoder class - no functional change (#65)

* code cleanup - use google style for videodecode sample and RocVideoDecoder class - no functional change

* rename SaveSurfToFile to SaveFrameToFile

[ROCm/rocdecode commit: 851c537904]

projects/rocdecode/.Doxyfile

@@ -946,7 +946,7 @@ WARN_LOGFILE           =
 INPUT                  = README.md \
                         api/rocDecode.h \
                         api/rocparser.h \
-                        utils/video_demuxer.hpp
+                        utils/video_demuxer.h
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses