ManagedCodecs 0.2.5

Faster H.264 decoding, the same output. The public API is that of 0.2.0, unchanged.

Changed

• H.264 decodes about 4.5% faster on one thread on the 720p benchmark stream (h264-bench-720p.mp4), bit for bit as
  before: each partition's reference picture is a byte handle rather than an object reference, Cb and Cr share one
  setup with a multiply-add chroma filter (SSSE3), 8-bit 4x4 and 8x8 inverse transforms run in 16-bit lanes (SSE2;
  32-bit for coefficients too large for them), CAVLC residual blocks read through a bit cursor in locals, ReadUe
  is inlined and a P_Skip macroblock no longer reads its neighbours twice (docs/conformance.md, Performance notes).