Extension:WikiLambda/Core objects

The following is a draft of the Core types of the wiki.

Let's decide on one way to represent them, otherwise it will get tiresome to keep them all in sync.

Moving the files to gerrit: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikiLambda/+/627932

After it has been merged, I am going to delete them from here so they don't get out of sync. --DVrandecic (WMF) (talk) 22:41, 16 September 2020 (UTC)