introduced a ModuleGroup (grouping ApplicationModules and other ModuleGroups) and enforced a proper hierarchy of modules to exclude that an ApplicationModule can own (directly or indirectly) another ApplicationModule

update for interface change in DeviceAccess: TransferElement::write() has now the version number as an argument

allow determining a fully qualified name for application variables (i.e. including qualified name of owning module)

made Module::connectTo() compile-time polymorphic, to allow special modules with operator() returning a different type.

Fixed several bugs affecting poll-type variables being read by a poll-type application variable and distributed to push-type variables via a ConsumingFanOut.

Changed Module::readAll() to read all push-type variables first, to make sure that poll-type variables are up-to-date upon return

This reverts commit 7287c4b4.

revert last commit, cascading ApplicationModules should be avoided instead (and should be prevented in future)

Cache accessors obtained through TestFacility::getScalar() and TestFacility::getArray() by the application test code, to avoid the loss of the current value if a decorated accessor is obtained again.

added support for the std::string data type and throw an exception if the type given by the user is unknown

also make sure for DeviceModules to always return the same sub-module with the [] operator when passing the same sub-module name

fixed not returning the same submodule on a second call of the ControlSystemModule::operator[] with the same module name

allow connecting a consuming node to a consuming node, if one of them already has been connected to a feeder.

don't crash the application if Profiler::startMeasurement() is called while the measurement is already running, instead just ignore the second call

Renamed Application::testableModeThreadName() into Application::threadName(), since this will be used for other purposes as well.

moved the xml generator main function into a new header file, to avoid defining main() multiple times by mistake.