Pass extra non-captured config.toml fields to DotCargo (BrainiumLLC#62)

* Add `DotCargoNet` to `DotCargo`

* remove unecessary into

* switch to a map of extra fields.

* Add serde_json to linux

* switch serde_json::Value with toml::Value

* Revert "Add serde_json to linux"

This reverts commit 06f2bb4.

src/dot_cargo.rs

@@ -4,6 +4,7 @@ use crate::{
 };
 use serde::{Deserialize, Serialize};
 use std::{collections::BTreeMap, fs, io, path::PathBuf};
+use toml::Value;
 
 #[derive(Debug)]
 pub enum LoadError {
@@ -104,6 +105,8 @@ impl DotCargoTarget {
 pub struct DotCargo {
  build: Option<DotCargoBuild>,
  target: BTreeMap<String, DotCargoTarget>,
+ #[serde(flatten)]
+ extra: BTreeMap<String, Value>,
 }
 
 impl DotCargo {