[IMP] web: tests: add a way to properly mock Widgets

This rev. introduces two helper functions for the tests: patch
and unpatch. Those function allow patching an Odoo Widget (e.g.
AbstractField), and unpatch it at the end of the test with the
guarantee that the Widget's prototype is exactly the same as it
was before the test.

This was necessary because the way it was done before was a little
bit too naive, and could lead to unexpected behavior. Indeed, doing

 var someFunction = AbstractField.prototype.someFunction;
 // test content
 AbstractField.prototype.someFunction = someFunction;

is correct if someFunction is actually define (or overriden) in
AbstractField, as in that case, it really exists on its prototype.
Otherwise, it isn't correct if it is not directly defined on the
prototype before the test, as it will be after..

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