try to decode ROC once
skip if error
inline init, remove multiple storage of digis
use hashmap
use emplace and =move
fetch fed once
removed a bunch of global variables. verify roc-number inline
removed another bunch of global variables
made PixelRoc thread safe. it is also faster now
remove cout
Merge pull request #2297 from VinInn/PixelRaw2Digi

Reco update -- Pixel raw2 divi speedup.