Fixed the confusing and inconsistently used names *_LINK_FLAGS and *_LINKER_FLAGS by always setting and getting both variables

Use mtca4u::setDMapFilePath() instead of the BackendFactory's member function. Since all applications will need it, the corresponding header file is now included in ApplicationCore.h

Removed the macros for defining accessors and introduced convenience classes instead. This adds slightly more syntactic sugar, but also allows more flexibility and seems to be a more coherent interface.

This commit incompatibly breaks the interface with the previous versions. Since ApplicationCore is not yet used in any productive environment, no compatibility is provided.

updated the example: use "using" syntax to inherit constructors and re-enabled the previously not working read-back of the device register "Variable".

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67054

- Default constructor for Accessor exists now
- A function Accessor::replace() allows to assign a new accessor
- For clarity/safety: copying accessors using the assignment operator is now forbidden
- The destructor of the accessor unregisters it from the module (to allow temporary accessors)

changed the internal thread implementation to boost::thread and make use of the interruption points to properly terminate the application

use NDRegisterAccessor class instead of ProcessArray, so that e.g. the ConstantAccessor works as well

Fixed a bug that a pointer to a temporary VariableNetworkNode object was sometimes stored (as a trigger receiver or source). Instead now an object with the same data pointer inside is stored.

added TINE_EXPORT C macro/constant to the compiler flags, which seens to be required for the latest DOOCS version

fixed a bug in the test: a module was defined at the same scope as the application, which lead to crashes when terminating the application sometimes
(same as last commit, but for a different test)

fixed a bug in the test: a module was defined at the same scope as the application, which lead to crashes when terminating the application sometimes

added function to obtain list of accessors from modules recursively (i.e. including accessors from sub-modules)

Added names and owners for modules, to build a full hierarchy chain. The syntax for creating modules is now not so nice, a better way has to be found (maybe by adding a macro if better solution can be found).

The readNoNBlocking() to obtain the initial values is now run on all ApplicationModules (incl. VariableGroups) before starting the first module, to ensure the intial values are really processed first.