Retire recursive methods

[louispt1]

We identified several unnecessary recursive modules which are no longer required, and some methods which can be refactored, renamed or removed.

Final Demand:

• No longer required, outdated charts and dashboard items should be cleaned up.

DependentSupply:

• Doesn't seem to be used anywhere, remove.

MaxDemand:

• Not used, remove

For the rest there are some question marks still over their usage, but for now no changes are required. The other methods will be re-assessed at a future point The 'abroad' methods should generally be retired, as the model does not use this distinction in the same way anymore.

[github-actions]

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[mabijkerk]

• Check ETEngine to see where these three methods live and what to remove
• Check all other repos to see if these methods are still used anywhere and remove them there as well
• Check the domestic dead end to see if it can be removed