feat(sail-calcs) and gui chores

[zolantris]

• add template code for valheim vehicles (probably a separate mod so rafters can avoid code bloat)

• Completes most of #8 by adding sail calculations so each sail actually matters and makes the ship fast

• add placeholder variables for drag and shearforce (mast destruction if put under too much stress).

• update readme with all the new propulsion config values

• attempt to fix meshes by calling loadZDO, but still sails meshes do not fix themselves. It might be better, but it is not fixed.

• resolves #25 by adding a new localization that changes based on state of the anchor. No GUI for overlays when actually sailing though.