Follow aliases when they are used in mixins or parent classes

[vinistock]

When a constant alias is used in a mixin operation or a parent class, we need to follow the alias to figure out what namespace it points to.

[vinistock]

• Add integrity check for owner relationships #592
• Avoid creating singleton classes for non-namespace targets #623
• Auto promote when creating constants inside namespace #622
• Fix corner cases of re-opening aliases #621
• Follow aliases when they are used in mixins or parent classes #620 👈 (View in Graphite)
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