code: public EnvVars overrideExpandingAll(@Nonnull Map<String,String> all) {
          for (String key : new OverrideOrderCalculator(this, all).getOrderedVariableNames()) {
              override(key, expand(all.get(key)));
          }
          return this;
      }
docs: Overrides all values in the map by the given map. Expressions in values will be expanded.
  See {@link #override(String, String)}.
  @return {@code this}