Add location plugin backed by a byte array
WIP: migrate SCIFIO I/O package to SJC

Still needs cleanup and restructuring to fit with SJC Location API.
POM: bump to 3.0.0-SNAPSHOT

After this point, there will be breaking changes to org.scijava.io.
Revamp the recently used files service

It is now the RecentService, and supports any type of Location,
not just String file paths.
WIP: Use Location, not String, in the I/O API
WIP