Draft: Adding thinning and skimming to DAOD_SCTVALID

This request adds the thinning and skimming tools to SCT AxAOD (DAOD_SCTVALID). The studies of tracking efficiency and hit position resolution need the high pT muons. The thinning tool keeps only the muon-associated tracks and the muon candidates in Zmumu events. The skimming tool requires at least one good quality offline muon. The flag was implemented to turn the thinning and the skimming on. The other small changes, adding the pixel tracklet and adding the isolation variables, are also implemented. tag: @csebasti, @janders, @fivone