Fix for variant changes.

Sources/SwiftGodot/Core/GenericSignal.swift

@@ -95,7 +95,9 @@ public class GenericSignal<each T: VariantStorable> {
             args.append(Variant(arg))
         }
         let result = target.emitSignalWithArguments(args)
-        return GodotError(rawValue: Int64(result)!)!
+        guard let result else { return .ok }
+        guard let errorCode = Int(result) else { return .ok }
+        return GodotError(rawValue: Int64(errorCode))!
     }
 
     /// You can await this property to wait for the signal to be emitted once.

Sources/SwiftGodot/Core/RawCall.swift

@@ -6,7 +6,7 @@ extension Object {
     /// All input arguments must be marshaled into `Variant`s.
     /// The result is a `Variant` that must be unmarshaled into the expected type.
     @discardableResult /* discardable per discardableList: Object, emit_signal */
-    final func rawCall(_ p_method_bind: GDExtensionMethodBindPtr, arguments: [Variant]) -> Variant {
+    final func rawCall(_ p_method_bind: GDExtensionMethodBindPtr, arguments: [Variant]) -> Variant? {
         var _result: Variant.ContentType = Variant.zero
         // A temporary allocation containing pointers to `Variant.ContentType` of marshaled arguments
         withUnsafeTemporaryAllocation(of: UnsafeRawPointer?.self, capacity: arguments.count) { pArgsBuffer in
@@ -33,12 +33,12 @@ extension Object {
             }
         }
 
-        return Variant(copying: _result)
+        return Variant(takingOver: _result)
     }
 
     /// Non-variadic variation on the emitSignal method.
     /// Used by GenericSignal.
-    public final func emitSignalWithArguments(_ arguments: [Variant]) -> Variant {
+    public final func emitSignalWithArguments(_ arguments: [Variant]) -> Variant? {
         return rawCall(Object.method_emit_signal, arguments: arguments)
     }