Initial changes so that the expert app possess most of the the calculator features

Specification of workspace:

• Possibility to input volume with floor surface and ceiling height. The total volume is displayed whether we choose directly the volume or the surface area and ceiling height.
• Slider for the relative humidity rate in the room
• String box for the room number (to be linked later to each CERN's rooms datas via the website: https://gis.cern.ch/)

Ventilation scheme: Ventilation types:

• Added a No ventilation scheme (later to be containing a residual air flow of 0.25 ach)
• Added a HEPA Filter option for all types of ventilation

In Mechanical ventilation:

• Added the possibility to input air changes per hour instead of just having air supply flow rate

In Natural ventilation:

• Possibility to choose between Sliding window and Hinged window
• Added a slider for the window width depending on the Hinged window
• Slider for opening distance
• Integer box for the number of windows in the room
• Slider for the window height

Infected:

• Possibility to change the number of infected people

Exposed:

• Possibility to change the number of exposed people

Global appearance:

• Aligned each parameters vertically so that we can see the graph without having to zoom out
• Changed 'Select' widgets for 'Dropdowns'
• Replace previous text header by a .png image of CARA's logo