Add of R functions paths for simulators and observers

* Added functions
* Added tests

(references OpenFLUID/openfluid#183)
Add of get/set/remove functions for parameters

* Added functions
* Added tests
* Sorted functions into R file

(references OpenFLUID/openfluid#183)
Add of removeAttribute function

* Added removeAttribute function
* Added tests

(references OpenFLUID/openfluid#183)
Rename of get/set simulation time step functions

(references OpenFLUID/openfluid#183)
Update for OpenFLUID framework compatibility

* Refactored build system, now uses CMake for configuration
* Added Qt linking in build system
* Adapted and cleaned code

(references OpenFLUID/openfluid#183)
Update of license file and source code headers
Maintenance operation (Merge)