[FEAT] Show total storage occupied by installed liveries

[FlightMS]

Description

At the moment it‘s not clear how much storage is occupied by additional installed liveries. Even when you install at lot of them, it will be a huge amount of storage needed - with acending trend.
To get a better overview, it might be helpful to know, how much storage is occupied by the liveries.

Solution

On the „Installed Liveries“ should be box or so, which shows the total amount of storage needed by all livieries which a installed at this moment.

Why is this the best solution?

More overview about installed liveries and the storage which is needed by them.

Additional context