feat: Add unix sockets

- Unix sockets run parallel to Named Pipes
  - Named Pipes will only run on non-Wine
  - If the game crashes, the next run will clean up an orphaned socket.
- Restructure RPC to be a bit tidier

Dalamud/Plugin/Services/IPluginLinkHandler.cs

@@ -1,6 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 
-using Dalamud.Networking.Pipes;
+using Dalamud.Networking.Rpc.Model;
 
 namespace Dalamud.Plugin.Services;