quant: re-order rdoq logic so only one RDO_CODED_LEVEL() call is required
quant: RDO_CODED_LEVEL macro can now be inlined for easier debugging
quant: rename sigCost to codedSigBits, comment nit
quant: levelDouble -> levelScaled

This always confused the heck out of me. The level was not doubled, it was not
a double, and it wasn't squared. It was just the level scaled by the quant
scale factor
quant: consistent comment style, improve comments
quant: change lastCG into a bool, use isOne flag to avoid abs() calls
update header and support Intel IACA marker
asm: cvt16to32_cnt[4x4] for TSkip
asm: cvt16to32_cnt[8x8] for TSkip
quant: hoist IEP_RATE out of getICRateCost