Add web_root option to the master server and use it create URLs for
resources hosted by it. This permits hosting the master server web
interface behind reverse proxy under a dedicated path.
Move item database, tests, endpoint definitions for /api/place,
/api/remove, /api/inventory, /api/inventoryAsObject, and the web
interface view for the storage page into the clusterioMod plugin.
Move the ejs templates to the default Express.js views/ folder and
change their extension to .ejs. Reconfigure Express.js to look for
templates in the views folders as well as the plugins folder. This
enables plugins to render templates using paths of following format
"pluginName/path/to/page-or-view".
Hornwitser