The Atlanta Falcons bolstered the depth of their roster after finishing up the NFL Draft last month. They welcomed those rookies, plus several dozen more rookies and a few veterans, to Flowery Branch last weekend for the rookie minicamp.  Ian Cunningham ended up signing four of those players from that weekend’s activities, reminding us that there is still a lot of movement left before we see anything close to a finalized 53-man roster in August.  Up next are organized team activities, but the roster building will continue throughout the next several months as we ramp up to training camp. Players will come and go, but there are still some veterans on the market who could make a lot of sense for this Falcons team.  Once all the rookie contracts are signed (Anterio Thompson and Avieon Terrell remain unsigned), Cunningham will have a little over $13-15 million in spending money to make a deal.…