timeshift/estimate watch date for items that were added before I created trakt account

[seanbreckenridge]

probably add to my my_feed.timeshift -- configure by letting my configure some start date for when I started watching media

e.g. on trakt:

Theres a feature to add items when it was released, which is what I did when I initially created my account

So -- should timeshift it based on release date to some point, e.g.:

if my media_start_date was 2005 account_creation_date was 2017

something released in 1920 -> 2005 something released in 1925 -> 2006 something released in 1980 -> 2009 something released in 2000 -> 2014 something released in 2016 -> 2016

[seanbreckenridge]

added in 0f6bc25bf37413567dac00a1b009c917ef87600e