add comment about csbfCtx computation
ctxInc table for significant coefficients coding is allocated dynamically.
de265_init() must now be paired with de265_free() or left out completely.
make library initialization thread safe
introduce coefficient Sb list
coefficient decoding pass 5 uses coeff.list now
simplified abs_level_remaining decoding
sign decoding with coefficient list
remove the now obsolete firstSigScanPos
save subblock scan order in coefficient list instead of final block position
save subblock scan order in coefficient list instead of final block position
remove obsolet computation of first/last-SigScanPos
pull out computation of coeff_has_max_base_level
decoding of greater-2-flag in coefficient list
remove greater2_flag array
add some comments
decoding of greater-1 flag now in coefficient list
remove explicit computation loop for has_max_base_level
remove non unnecessary numGreater1Flag and firstCoeffInSubblock variables
reorganize significant coeff decoding into correct order for coefficient list
last significant coeff