added WAYBAR_HIDDEN env var used to hide the waybar

[Skerga]

Added a check for WAYBAR_HIDDEN=yes to the base-app image.

side effect is that this made it necessary to overwrite $HOME/.config/waybar/config.jsonc on every start to allow to switch between hidden and visible. Also every image using the base-app image will need to be rebuild.

i tested the change with a local build Lutris image and it worked fine.

[ABeltramo]

There has to be a better way to do this without having to duplicate the full file.. I'll look to see if Waybar supports multiple config files and how it merges conflicting configs

[Skerga]

I changed around the way i achieved hiding the waybar. I added a small python script that searches for, and changes the 3 variables i used for hiding the waybar.
its not yet perfect since there is no check if those 3 variables are in the config. if some are missing my script wont set them currently. I might also rewrite the script in the following days so it will be more robust.

I also thought about doing this fully in bash with sed but my sed skills aren't up for the task and imo sed always ends up looking way to cryptic to maintain