search: remove curUseRDOQ argument from encodeResAndCalcRdInterCU, always true
search: hard-code curUseRDOQ
search: remove curUseRDOQ arguments from two more methods

residualTransformQuantInter and xEstimateResidualQT were always called with
curUseRDOQ = true, and the flag was never changed
quant: remove curUseRDOQ argument from transformNxN, always true
quant: comment nits
quant: disallow psy-rdoq if transformSkip was used

psy-rdoq is not possible without a transform. Or said another way, we would need
a different psy-rdoq approach for transform skip
quant: inline the quant method, only called from transformNxN
quant: don't pass member variable to class method
quant: denoise nits
quant: sign hide nits
quant: cleanup coeff group zero-check code
quant: rdStats -> cgRdStats
quant: assign a signal cost of zero to zero coeff after lastNZ

This stack variable was uninitialized otherwised, and could have been used
during the optimization of lastNZ
entropy: cleanup calcCost, add EMMS for float safety
quant: nit
pixelharness: fix MSVC warning about intptr_t conversion to int
psy-rdoq: include psy-cost in uncoded coefficient distortion

Without this adjustment, uncoded coefficients were possibly being penalized
over coded ones with less psy value.
bugfix: disable aq only when both aq-strength and cu-tree is off

AQ can be on when cutree is on even if aq-strength is 0.Do not force aq to be
off whenever aq strength is 0.
rc: add slow first pass as option. set turbo first pass as default in 2 pass