fix(core): Removes implicit cast between Serial and uint (#728)

* Fixes spellbooks using serial ctor
* Fixes misc items where someone thought they had an amount and it didn't
* Fixes all `Food` types.

Projects/Server.Tests/Tests/Network/Packets/Outgoing/LightPacketTests.cs

@@ -22,7 +22,7 @@ namespace Server.Tests.Network
         [Fact]
         public void TestPersonalLightLevel()
         {
-            Serial serial = 0x1024;
+            Serial serial = (Serial)0x1024;
             byte lightLevel = 5;
             var expected = new PersonalLightLevel(serial, lightLevel).Compile();