properties
* Add properties to chain spec * Read properties as serde_json::Value * Use a serde json::map::Map directly for properties * Add type alias for json Map * Update chain_spec.rs
node-service
* Move `chain_spec` into `node-cli` * Fixes tests * Adds `construct_simple_service` and `construct_service_factory` macros * Remove the `node-service` crate * Add some documentation * Fixes compilation on stable