Remove module-level order restrictions

[iamdefinitelyahuman]

What I did

Remove restrictions on ordering of elements within the module-level namespace of a contract.

The only restriction this does not remove is that functions may only call upward - that logic is fairly intertwined with global_context and will take some work to eliminate.

How I did it

• Removed some checks in global_context
• Removed failing tests
• Checked the documentation - this behavior was never documented so nothing needs to be changed there

How to verify it

Run tests.

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