- Added config file to set the "show online timeout" via config

[xuneXTW]

Users should be shown online as long as they are active on the page.
For this reason i have added a separate config for use as "activity timeout".

[GabrielDeveloper]

@xuneXTW,

Thanks for the PR, but the configuration session.lifetime is an own Laravel session config, do not make sense change because if we has a cache expiration interval biggest than session lifetime and the session expire on Laravel, on the package the user will be appear how online yet!

[xuneXTW]

@GabrielDeveloper yes but in this case it will be an configuration issue. The thing is, most of the configurations will have an session.lifetime set to 2 hours or more. The "user-online" should display if the user is active on the page or the app, not if the user is "Logged-in" with a valid session. I use this change in my own app and it work like a charm. Everyone who want to have the user-activity-timeout set to session.lifetime can do this by setting both parameters to the same value.