Input device calibration and capabilities.

Finished the input device capability API.
Added a mechanism for calibrating touch devices to obtain more
accurate information about the touch contact area.
Improved pointer location to show new coordinates and capabilities.
Optimized pointer location display and formatting to avoid allocating large
numbers of temporary objects.  The GC churn was causing the application to
stutter very badly when more than a couple of fingers were down).
Added more diagnostics.

Change-Id: Ie25380278ed6f16c5b04cd9df848015850383498