Redesign of HomeWidget in OpenFLUID-Builder with Qt

* Added ui file for HomeWidget
* Added recent project information as tooltip
* Fixed bug in dialog for opening example project
* Cleaned code

(references OpenFLUID/openfluid#246)
Redesign of ProjectWidget in OpenFLUID-Builder with Qt

* Added ui file for ProjectWidget
* Added empty widgets classes and ui for project tabs  
* Cleaned code

(references OpenFLUID/openfluid#246)
Rough outputs browser in OpenFLUID-Builder with Qt

* Added outputs files explorer
* Added button for clearing outputs contents
* Added button for browsing outputs directory using system explorer

(references OpenFLUID/openfluid#246)