[Feature] Adding a progress bar when games are downloading

[lopiv2]

It would be a great feature to add a progress bar while game is downloading and installing. I know we have the possibility of having a notification when game ends installing, but this is a great ui improvement, i think.

[saitatter]

Hey lopi, I did something similar to what LanCommander has. I made a pull request with it.

[gantoine]

This has been released in 0.5.0!