Revert "Rename Spells to Spells.java"

This reverts commit 354f4f75ed9cf3dce212ca3d2f294d17c093c1e3.
Revert "Revert "Rename Spells to Spells.java""

This reverts commit 03365da088d7d3320fac2acfaece4f64db27d951.