add a simple log viewer for servers

As the title says.. I did this because didn't find a simple way to display the logs for each server. So I thought it would be best to view a log in a place that is related to the server.

It adds two buttons (access and error log). Selecting a server and opening a log will open a grid with all rows where the latest row is at the top. Clicking a row here will pop up a message window displaying the full message (since it doesn't always fit in the normal grid).