Support for maximum values in layout GridLayout.

A cell's ability to shrink or stretch is now integrated with the
constraints system, which is now supplied with both upper and lower
bounds.

Also:

. Remove package private access (pseudo) annotation
. Remove rowWeight and columnWeight attributes and fields
. Remove code to handle weights

Change-Id: I9e2432101d15466c621f51ae362435051fab5764
10 files changed