- move all platform sources to one central folder under src/platform/name
- don't add obj-c sources on windows or platform files from other platforms on all platforms
- replies are now handled by returning from the listener callback
- can now handle multiple IPC connections at once
- make Loader::s_unloading actually thread-safe
- add preliminary IPC stuff
- preliminary IPC implementation on Windows (will evolve still)
- more ids
- move InternalLoader platform definitions to their own files
- fix ranges::map not resizing the output
