Updated to use the new ReadAnyGroup instead of the old readAny function. Some tests are still hanging or failing (mostly due to shutdown issues)

use a different work around for the thread_local problem: moving the code using the thread_local specifier to the cc file also solved the problem and does not require a complicated work around using a map...

Changed an exception into an assert, since the function is only internally used and the exception is never thrown. Clafiried the documentation about this.

removed incorrect implementation of operator[] and operator() in ApplicationModule (and use the implementations of ModuleImpl instead)

don't catch the exception thrown when we cannot obtain the testable mode lock, this is no longer necessary as all threads will obtain the lock at the beginning

excluded some more assert-like exceptions from coverage report and changed one into an actual assert

reduced the timeout for stall detection of testable mode to 1s, which should be perfectly long enough

refactored a type if-then-else monster into a for_each loop and exlcuded a pure cout function from the converage report

- clarified some comments

Proper implementation of move constructors and move assignment operators for all module types (including tests for the assignment operator)

Fixed a bug that sometimes variables were read (resp. written) in groups despite they were outputs (resp. inputs). This was happening with device variables since they are bi-directional. Now no longer the information from the accessor is used whether this variable is readable or writeable, but the information from the VariableNetworkNode which direction this variable should have.

fixed connectTo() so it now uses the dynamic/virtual model and thus obeys e.g. eliminated hierarchies etc.