This PR add scripts and prefab to quickly add gui in scenes to activate/inactivate display of SOFA features. right now handle:

SOFA simulation control:

• Play/Pause simulation
• Reload simulation
• SOFA and Unity FPS display

SOFA models display:

• visual model
• FEM von mises
• collision models
• collision output (if the scene has a

Also add a Debug console to display:

• SOFA logs: log/warning and error