Use language-overridable scope for configuration settings

[adam-fowler]

Have you considered using scope language-overridable for some of the configuration settings? Given #927 I wanted to add a configuration default for the swift extension

"[swift]": {
  "lldb.launch.expressions": "native"
},

But apparently I can't because the setting scope does not allow it.

[vadimcn]

Not sure this will achieve what you want: the expression type is determined at the start of the debug session, and in this case, it would depend on what file you had active in the editor at that moment. Hardly intuitive behavior...

[adam-fowler]

make sense