- add list with shared ptr of transferElements for recovery write
  - add shared mutex

  - Cleanup:

    - Reorder code in Application::createDeviceVariable
    - Separated ExceptionHandlingDecorator constructors for writable and
      non-writable registers
    - cleaned up doPreWrite

  - First compiling version, tests pass, hope it works...
  - Needs some tweaking

Merge VirtualModules which have the same name. This doesn't really make a difference, but e.g. the output of dump() will be much cleaner.

Fixes #68

TestableMode: ApplicationModule guarantees that the main loop thread had the testableModeLock at least once. Solves #66

Moved setting the initial version number for all ApplicationModules from Application::initialise() to Application::run(), so the version numbers of the persisted values from the control system are smaller.

  (first part of #65)

(Currently untested as the recovery does not work in DeviceAccess. calling open() again just does nothing.)

Fixes #53

- Exception handling decorator and ThreadedFanOut send condition variable notificatios via the DeviceModule
- FanOut sends terminate to impl and all slaves.
Solves (some?) shutdown issues, but breaks bi-directional array test.

supposedly fixed implementation, but tests are conceptually broken and/or implementation cannot be terminated

Otherwise it is impossible to shut-down the server if the device could
not be opened at all or is in constant error state

- fixed bug that there was a nullptr exception handler in the list with default value from constructor (caused all ApplicationCore to fail)

first implementation of device initialisation handler. Simple test passes, but needs to be extended.

implemented first interface change in DeviceModule to support initialisationHandlers. Test in place but failing due to missing implementation.

Fixes #39

rename VersionNumberUpdatingRegisterDecorator into MetaDataPropagatingRegisterDecorator, as it does more than just updating the VersionNumber now