[WIP] Add support for events (#60)

* Add support for events, move concept of domains to IpcService

* Support waiting for KThread, remove some test code, other tweaks

* Use move handle on NIFM since I can't test that now, it's better to leave it how it was

Ryujinx.Core/OsHle/Ipc/IpcMagic.cs

@@ -0,0 +1,8 @@
+namespace Ryujinx.Core.OsHle.Ipc
+{
+    abstract class IpcMagic
+    {
+        public const long Sfci = 'S' << 0 | 'F' << 8 | 'C' << 16 | 'I' << 24;
+        public const long Sfco = 'S' << 0 | 'F' << 8 | 'C' << 16 | 'O' << 24;
+    }
+}