Fix user config file feature loading post config separation

[qdot]

User config files load, but:

• We don't error if there's a mismatch (i.e. user file has feature base doesn't)
• We can pass blank outputs to features instead of just skipping the feature entirely if it has no inputs/outputs
• Still need to completely remove rotate_with_direction in favor of using i32 with rotate
• User configs that derive from default configurations don't match correctly, and should use UUID matching instead of identifier matching anyways.

Tests for all of this would be nice.