After 18 months operating in stealth development mode, Portland-based WebCease is making its public debut. The company is tackling what is expected to be a growing market: helping families and estate attorneys track down a deceased person’s digital footprint. Each year 2.6 million Americans die and with more and more of our lives occurring online, from social media to shopping to travel, there is a lot for loved ones to track down once we are gone. And then what do you do? “We focus on the…