Add average lowest price values

[Nixinova]

Feature Description

Average price can be a useful metric but I buy all my games on sale so it isn't really accurate. It would be useful to have an option to show the average of all the lowest prices to more accurately reflect my statistics.

Implementation

This text could have onclicks on the words "lowest prices" and "todays prices" to change the "average price" values to "average lowest price".