[Android] Intent for starting offline mode

Feature: if TT-RSS Android receive an intent (from Tasker or similar automatization tool), it should starts process to offline mode (download articles and than starts offline mode)
Purpose: I want to take my phone at morning with full list of articles (downloaded via WiFi) to read in a subway

if someone makes a clean implementation i’ll consider merging a PR, otherwise don’t hold your breath

as far as i’m concerned if you don’t have proper data connection in $CURRENT_YEAR it’s entirely on you