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Motivation
Closes #1940
This PR starts lazily resolving method aliases, so that we can show the correct information for aliases in definition, hover, completion and signature help.
Implementation
The idea is quite similar to constant aliases. If we encounter an unresolved entry, we try to resolve it recursively (since an alias can point to another alias). Then we store the resolved entry in the index so that we don't have to do it next time.
Automated Tests
Added tests for the index and for all of the features.