Added Header and DB Status

Hi DrZoidberg,

Great work with the new enhancements to plexWatchWeb.  I thought you might be interested in these simple changes I made.  I added a central header file and call it from each page to reduce the amount of code on each page.  I also updated the settings and added some new fields for checking whether the plexWatch database is online or offline (optional).  Lastly, I include the total play count on the main (index) page.  Please try them out and if you approve, merge the changes.  :)