feature request: add config line number in warning and error messages

[mttbx]

add config line number if possible when there's an error in waybar config.

[zjeffer]

JSON parsing errors already show the line number if you do something like this:

{
    "this-key-has-novalue": ,
    "this-key-does": true
}

which shows:

./build/waybar --config config.jsonc
[2024-05-06 19:52:13.594] [info] Using configuration file config.jsonc
[2024-05-06 19:52:13.595] [error] Error parsing JSON: * Line 2, Column 27
  Syntax error: value, object or array expected.

What other kind of config errors do you mean?

[mttbx]

I don't remember what error it is. But some errors are not shown with line number.