Cleanups for stripping21 stack

• Remove MicroDST/MicroDSTTools, moved to Analysis/stripping21-patches
• Remove MicroDST/MicroDSTBase, moved to Analysis/stripping21-patches
• Remove MicroDST/MicroDSTAlgorithm, moved to Analysis/stripping21-patches
• Remove Phys/DSTWriters, moved to Analysis/stripping21-patches
• Remove Phys/DaVinciTransporter, moved to Phys/stripping21-patches
• Remove Calo/CaloPIDs, moved to Rec/stripping21-patches
• Remove Event/EventPacker, moved to LHCb/stripping21-patches
• Remove Event/MCEvent, moved to LHCb/stripping21-patches
• Remove GaudiConf, moved to LHCb/stripping21-patches
• Remove redundant Lbcom dependency
• Remove obsolete davincisys.configurables test for SVN