initPlugins parameters object

[james-owen]

Is your feature request related to a problem? Please describe.

When initializing plugins, occasionally several arguments are needed, which makes for too many arguments being passed to a single function.

Describe the solution you'd like

The function initPlugins in plugins.js should pass an object to each plugin.

Current:
plugin(router, pluginDBAdapter, publish, sites)

Suggested:
plugin(router, paramsObject)

[james-owen]

Pull request to add a 5th parameter to this function #655

[james-owen]

@pedroalbr Considering getting the params object started now, while we're working with plugins and potentially adding more params. The params would look like this:
plugin(router, pluginDBAdapter, publish, sites, paramsObj)
instead of the current:
plugin(router, pluginDBAdapter, publish, sites, site, [additional params])