experimental type alias replacement

This was an idea I had. This MR adds a list of type aliases to InPartS. const TYPE_ALIASES = Vector{Pair}[] New aliases are registered by push!ing them into this vector.

These would then iteratively be applied with replace on any type to be reconstructed. The more aliases, the more expensive it gets, but it sits in front of an eval so might not be relevant.

This change eliminates the need for evaluating all kinds of consts into different modules for fix_import or defining custom reconstruct_subtype overwrites.

This is a non-breaking feature.