Don't use _mm_maskmoveu_si128 but faster MOVD.
Update struct member alignment if necessary.

Some compilers/linkers (found with gcc from NativeClient) don't align properly, so this might need to be adjusted.
consider LT pictures in deriving spatial motion vector candidates
store picture's LSB in image structure
fix access to SPS when reading slice header
consider long-term pictures in temporal MV prediction
allow to adjust logging verbosity with the command line
move RefPicList from image to slice header as it can be different in each slice
fix slice-header cleanup when releasing images
RASL at beginning of streams now only remove _past_ references from DPB
saving to YUV considers conformance window bounds
some code simplification in MVP candidate extraction
comments and more detailed logging in MC
fix DPB management with unavailable references
added remaining SEI message codes
fix slice-header cleanup when frame-size changes within the stream
Merge pull request #44 from fancycode/no_maskmove

Don't use _mm_maskmoveu_si128 but faster MOVD.
Merge pull request #45 from fancycode/update_struct_alignment

Update struct member alignment if necessary.
fix: prevent new picture in DPB from being overwritten by unavailable reference
fix compiler warnings in SEI processing