so far, only scalars work and the meta data (macro pulse number etc. is missing)

- Replace the std::reference_wrapper<TransferElement> with a TransferElementAbstractor.

Fixed a type confusion between int64_t (aka long int on 64 bit platforms) and long long int. The types are not identical (in the C++ sense) but bit-compatible. ChimeraTK expects int64_t while DOOCS expects long long int.

- fixed last tests which were not using timeout based checks

introduced flag to indicate when doocs initialisation is done. Removed all sleeps in the server based tests.

Removed update functions completely. The long sleep made the server unresponsive. Instead the call to run update in the tests was replaces with a sleep. Sometimes fails, as expected with a fixed timeout, but it was as hack anyway.

changed updater to run in its own thread. Tests still using doocs update, which is just doing an insanely long sleep of 1 second.

separated DoocsSpectrum into header and cc file, as it should be. It was still header only from the time where it was a tempates class.

all EqFcts are using common updater. Tests passing, but locking is not done properly across EqFcts (race conditions with RPC calls possible).

changed DoocsFactory to not create unnecessary decorators of the wrong type when auto-creating variables. Test for spectra still failing

Updater is using a vector of callbacks now. Not working as intended because there are different decorators where they should be the same.

changed interface of VariableMapper (list of descriptions instead of map because concept of 1:1 mapping does not work). Class compiles, but the rest of the lib incl. tests is not adapted yet

renamed the intermediate function 'new_create' back to create, which had been removed after it was obsolete

removed map which has been put into the DoocsAdapter class in the beginning but the put into the updater