I believe it is important to keep the names consistent everywhere, even
the tests. If our direction moving forward is to use the LibX
convention, then that should be reflected everywhere.

Added `foo.@var` to read an instance variable of another object. Later this will only be allowed inside foo's type.

Added “Type.class” as a metaclass literal. This allows doing, for example, a = [] of Foo.class; a << Foo; a << Bar where Bar < Foo