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A bit more loop unrolling, and moving some constant code to the global init function

Convert the style of the deblocking code to the standard x264 style
Eliminate some trailing whitespace

Along with a bit of related code reorganization and macroification

Faster variance calculation

Early termination for bS=0, alpha=0, beta=0
Refactoring, various other optimizations
About 30% faster deblocking overall.

This code seemed to act up unexpectedly sometimes, creating a situation where in 1-pass VBV mode, a frame's quantizer would drop all the way to qpmin and then shoot back upwards to qpmax, causing serious visual issues.
This change may decrease bitrate in VBV mode, but that is preferable to the artifacting produced by this code.

set the chroma DC coefficients to zero for residual coding in qpel-rd
fix C99ism

a do/while loop can be used for residual_write, but i8x8 had to be fixed so that it wouldn't call residual_write with zero coeffs
proper nnz handling added to cabac intra rd refine
chroma cbp added to 8x8 chroma rd
cbp was tested, but wasn't useful

Split into a separate commit because this changes rounding, and thus changes output slightly.

if vbv is not enabled (and especially in crf/cqp), we have to guess max bitrate, so we might underestimate the required level.

(no immediate effect, since nothing writes such values yet)

Allow a QPfile to contain fewer frames than the total number of frames in the video and have ratecontrol fill in the rest.
Patch by kemuri9.

Bug report by Sigma Designs, Inc.

In rare cases CABAC desync could occur, causing bitstream corruption

Doesn't affect the CLI, but potentially important for programs which call x264 as a shared library.

Bigendian systems didn't have endian_fix32 defined

Also remove display of "PCM" if PCM mode is never used in the encode.
L1 reflist information will only show if pyramid coding is used.

In RD mode, always consider PCM as a macroblock mode possibility
Fix bitstream writing for PCM blocks in CAVLC and CABAC, and a few other minor changes to make PCM work.
PCM macroblocks improve compression at very low QPs (1-5) and in lossless mode.