TrigT1RPChardware: delete obsolete files

Frank Winklmeierrequested to merge
fwinkl/athena:fwinkl_20210730T180742 into master

Delete several obsolete/unused files:

  • share/configuration: not used and not installed in the release
  • Lvl1RpcConf, Lvl1RpcTrig, main: unused C++ sources that are not even compiled anymore (probably some standalone programs at some point)
  • RXReadOut, RPCROD: was only used in the above files
  • RpcBook: only a unused dummy implementation

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