added brownian but sligtly biased priority delta for sequence jump, and shared a random one for byte-based ones
added brownian but sligtly biased priority delta for sequence jump, and shared a random one for byte-based ones

ouspg/radamsa,zhuyue1314/radamsa,shjalayeri/radamsa,richinseattle/radamsa,pedrib/radamsa,0xr0ot/radamsa,richinseattle/radamsa