size_t has different types on 32 vs 64 bit systems. UL is correct for
64. Just use the ::size_type define to help it figure it out properly

(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

use the new DeviceAccess .DUMMY_WRITEABLE variable in tests. Writing to the readonly version now throws.