researchLogger detail on IME sessions

log device type, screen size, etc.  also simplification inside ResearchLogger
to use exceptions better, and fix ResearchLoggerTests to not change
preferences to specify the logfile.

multi-project change with Idfd193b16260215cca32886e288f03a0c12b2781

Bug: 6188932
Change-Id: Idd3ca6eb8e8e3934f68234b241c7fd7d0cc3bcd5