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.

added missing implementations of writeDestructively() - the inherited ones from the DeviceAccess classes are not doing the right thing...

- run xml generator as a test
- use project template
- have a version number

remved the library without path from the _LIBRARIES. It is added with path by the config file anyway, which makes linking easiser because you don't need the link path variable.

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

So that the compiler complains if one accidentally uses it through
implicit type conversion "" -> bool and the hierarchy is screwed up

Issue38

moved exception handling documentation into its own dox file and added documentation about DataValidity flag propagation