Draft: Updates to the HoughRootOutputTool and adjacent changes.

Changes to the HoughRootOutputTool (FPGATracKSim Tool to output Road/Track/Hit information e.g. for NN training):

• Adding a number of extra variables (custom volume ID information as used elsewhere, hit information for truth tracks, sorted Hough candidate hits, fakelabels for hough candidates)
• Calculate idealized coordinates for Hough candidate hits

Other changes:

• move dataFlow tool before the HoughRootOutput call in FPGATrackSimLogicalHitsProcessAlg to avoid output tree namespace issues
• add flag writeOutNonSPStripHits for HoughRootOutputTool
• Fix typo in FPGASpacePoints_2nd handle key
• Add HoughRootOutput flags to FPGATrackSimAlgorithmTags
• Add overlay input file reader for overlaying different samples (FPGATrackSimReadInput2Cfg in FPGATrackSimAnalysisConfig)
• Fix hard-coded values for flags in FPGATrackSimAnalysisConfig (DoHoughRootOutput)
• Add THistSvc for HoughRootOutput
• Fix wrong default value for m_barcode in the FPGATrackSimTrack class
• Fix wrong default value for bad in the FPGATrackSimMultiTruth class

@jahreda @imaznas