Introduction of wares development integration in OpenFLUID-Builder

* Added Development menu
* Added source edition from model and monitoring 
  when double clicking on simulators and observers
* Added empty methods for later integration 
  of development functionalities
* Added compiler definitions to temporarily enable/disable wares
  development in OpenFLUID-Builder
* Refactored WareWidget design, using Qt promoting mecanism

(closes OpenFLUID/openfluid#496)
Add of a configuration variable for path to waresdev resources