rename menus to MC/Dev_pp_run3_v1 and add L1 menus

Trigger/TriggerCommon/TriggerMenuMT/CMakeLists.txt

...mmon/TriggerMenuMT/python/HLTMenuConfig/Menu/Dev_pp_v1.py

...rCommon/TriggerMenuMT/python/HLTMenuConfig/Menu/LS2_v1.py

...ommon/TriggerMenuMT/python/HLTMenuConfig/Menu/MC_pp_v1.py

...r/TriggerCommon/TriggerMenuMT/python/L1/Config/ItemDef.py

...mmon/TriggerMenuMT/python/L1/Config/ThresholdDefLegacy.py

...ger/TriggerCommon/TriggerMenuMT/python/L1/L1MenuConfig.py

...TriggerCommon/TriggerMenuMT/scripts/generateL1MenuRun3.py

...iggerCommon/TriggerMenuMT/scripts/generateL1TopoMenuMT.py

...TriggerCommon/TriggerMenuMT/scripts/generateLVL1MenuMT.py

...ger/TriggerCommon/TriggerMenuMT/scripts/generateMenuMT.py