Extend configuration engine for backup and versioning of configs

Upgrade the configuration engine to allow for:

• Individual configurations to be retrieved/applied.
• Make configuration engine use application storage;
• Migration code from install directory to application storage;
• All configuration files to be retrieved/applied - possibly zip them up?
• Endpoint methods to allow for UI integration;
• UI for configuring settings and retrieving/applying configuration.

See https://unifysolutions.jira.com/wiki/pages/viewpage.action?pageId=41320640 for further details.