Suggestion filtering incorrectly filters static calls.

[dantleech]

Currently we would filter class suggestions for classes which are compatible with the parameter type, however often we may want to use a factory to create the parameter type, which is also a class, e.g. $layout->constraints(ConstraintFactrory::percentage(50)). Currently ConstraintFactory would not be suggested.

In general:

• if we are making a static call then it's better to show all class results.
• unless we further filter to classes with static mehods that return the wanted class.

[dantleech]

fixed