Add constraint solver

GtkConstraintSolver is an implementation of the Cassowary constraint
solving algorithm:

  http://constraints.cs.washington.edu/cassowary/

The Cassowary method allows to incrementally solve a tableau of linear
equations, in the form of:

  x = y × coefficient + constant

with different weights, or strengths, applied to each one.

These equations can be used to describe constraints applied to a layout
of UI elements, which allows layout managers using the Cassowary method
to quickly, and efficiently, lay out widgets in complex relations
between themselves and their parent container.

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