Some methods don't use `ComputerLookup`

- [ ] `ExtensionLoader.ReloadExtensionNodes`
- [x] `ISPDaemon.DrawIPEntryScreen`
- [x] `ISPDaemon.DrawLoadingScreen`
- [x] `MissionFunctions.findComp`
- [x] `Multiplayer.getComp`
- [x] `NetworkMap.discoverNode(string)`
- [x] `Programs.computerExists`