Enhancement: Settings should be loadable from the environment

[newbeeDotA]

Enhancement request title: Settings should be loadable from the environment Use case: Load settings from the environment in containerized environment for better synchronization between containers and a easy to deploy application. Current behavior: Settings cant be loaded form the environment, only from the system.json file. Requested behavior: Load simple settings (strings, bools, numbers) from the environment. Recommended implementation: go through all applicable settings and check for a environment var that corresponds with it and overwrite the loaded setting. Usefulness of the enhancement: makes containerized applications more easy to deploy without changing the system.json file for each deployment.

PS: Iam already on developing something like this at the moment, so i could do a PR soon on this.