Allow compressed liveries in the state directory (saved games)

[nootshell]

Certain liveries in the CoreMods folder are compressed .zip archives to reduce the installation footprint of DCS. To my knowledge, those same archives do not work when placed under the Saved Games/DCS(.openbeta)/Liveries directory. Nor those of other liveries, repacked as .zip archive using the same structure.

I'd like to propose to make this available to the aforementioned directory. Doing so would significantly reduce the footprint of certain liveries (one example being a 1.00 GiB livery becoming 198.72 MiB when compressed) and significantly ease the installation of liveries since most issues still come from users messing up the directory tree.

Edited November 16, 2021 by Nootshell
Removed unnecessary screenshot