RLGR, Progressive, RDP8.1 H264, MS-RDPEDISP

RLGR: rewrite RLGR1/RLGR3 decoder using __lzcnt, leading to 2-3x faster implementation. RLGR1 is used in the RDP8 progressive codec, as well as RDP7.1 RemoteFX.

Progressive codec: start parsing progressive codec messages and decoding part of it.

RDP8.1 H264: make OpenH264-based implementation work.

MS-RDPEDISP: cleanup and update to final version of the specification (previous code matched 2012 R2 preview).