Shields need to be integrated properly with exefs

[steven11sjf]

Shields work for the most part but have minor issues since the exefs handles basically all the vanilla assets by name. This seems to take place in the function at offset 7100e2aab0 in the 1.0.0 exefs, or in the function at offset 7100e341f0.

Known issues:

• New shields only highlight shields on the same side of the door when using Y to highlight
• Vanilla shields replace their label with ??? when their required item is not acquired (for example, Wave Beam for Wave Covers). Ideally this behavior would be reversed or removed.