Implemented Upcoming events cutoff days

I've added a new option that lets you set the cutoff days for Upcoming Events. Currently the system is hard coded at 30 days. This lets you lower that for really busy sites (and vice versa for sites without much current activity).

The new option is the first option in the Events options section of the Sportsbook options. As mentioned above, the default is 30 (which is what it always has been).



For example, during the NFL Season, I have been editing the function in the repository to set the hard coded value (30) to 7, so that only the current weeks upcoming events would be displayed. Now I can lower it during the season and raise it back up after the season without editing the file!