[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/Services/Am/AmErr.cs

@@ -0,0 +1,7 @@
+namespace Ryujinx.Core.OsHle.IpcServices.Am
+{
+    static class AmErr
+    {
+        public const int NoMessages = 3;
+    }
+}