message: Fix configuration not always using resource scope
  When requesting a nested configuration section (e.g. `a.b.c`), the configuration should still be using the `resource` scope, and act the same as when requesting a more global configuration section (e.g. `a`).
diff: @@ -50,7 +50,7 @@ export class ConfigurationFeature implements StaticFeature {
  if (index === -1) {
  result = workspace.getConfiguration(undefined, resource).get(section);
  } else {
  - let config = workspace.getConfiguration(section.substr(0, index));
  + let config = workspace.getConfiguration(section.substr(0, index), resource);
  if (config) {
  result = config.get(section.substr(index + 1))
  }
  