[v1.40.0] Remove code deprecated in v1.30.0

[Geod24]

Release v1.30.0 was a massive release (337 commits).

The main changes were:

• Various API deprecation as Dependency was made a discriminated union and its various components were broken down;
• Overrides were deprecated;
• Configy was used to parse all JSON files;
• Ability to set Dub's root path and a few other items were deprecated;

Once v1.39.0 is released, we can merge this PR and get rid of a lot of deprecated code, which will also massively simplify future work.