add harmonised TauFilter, include most recent PowhegControl updates, update to...

add harmonised TauFilter i.e. xAODTauFilter and TauTruthSlimmer - it is to use xAOD variables for filtering on EVGEN level

include most recent PowhegControl updates, i.e. the following MR to 21.6: !41888 (merged) !41888 (merged) !42404 (merged) !42624 (merged)

update to Powheg-05-00,

add fix for counting events in LHE file, as done in !42696 (merged)

add LHE filters, as done in: !41851 (merged)