More refactors around assets. Trust me, we need them

src/engine/Atom.zig

@@ -1,9 +1,9 @@
 //! Module for string interning. A string can be converted to a stable integer
-//! constant, called an *atom*. The value of an for a given string is guaranteed
-//! to be stable throughout a program's runtime, but not across different runs.
-//! There can be no more than 2¹⁶ atoms.
+//! constant, called an *atom*. The value of an atom for a given string is
+//! guaranteed to be stable throughout a program's runtime, but not across
+//! different runs. There can be no more than 2¹⁶ atoms.
 //!
-//! Use this module for converting string IDs into numbers, so that they can be
+//! Use this module to convert string IDs into numbers, so that they can be
 //! compared more easily. The users of this module should import it with
 //! `@import("Atom.zig").Atom` and use the methods available in the `Atom` type.
 
@@ -76,7 +76,7 @@ pub const Atom = enum(u16) {
     }
 
     /// Cast an atom into an integer.
-    pub fn toInt(self: Atom) u32 {
+    pub fn toInt(self: Atom) u16 {
         return @intFromEnum(self);
     }