Move solution and projects to src

src/Ryujinx.Horizon.Common/ISyscallApi.cs

@@ -0,0 +1,33 @@
+using System;
+
+namespace Ryujinx.Horizon.Common
+{
+    public interface ISyscallApi
+    {
+        Result SetHeapSize(out ulong address, ulong size);
+
+        void SleepThread(long timeout);
+
+        Result CloseHandle(int handle);
+
+        Result WaitSynchronization(out int handleIndex, ReadOnlySpan<int> handles, long timeout);
+        Result CancelSynchronization(int handle);
+
+        Result GetProcessId(out ulong pid, int handle);
+
+        Result ConnectToNamedPort(out int handle, string name);
+        Result SendSyncRequest(int handle);
+        Result CreateSession(out int serverSessionHandle, out int clientSessionHandle, bool isLight, string name);
+        Result AcceptSession(out int sessionHandle, int portHandle);
+        Result ReplyAndReceive(out int handleIndex, ReadOnlySpan<int> handles, int replyTargetHandle, long timeout);
+
+        Result CreateEvent(out int writableHandle, out int readableHandle);
+        Result SignalEvent(int handle);
+        Result ClearEvent(int handle);
+        Result ResetSignal(int handle);
+
+        Result CreatePort(out int serverPortHandle, out int clientPortHandle, int maxSessions, bool isLight, string name);
+        Result ManageNamedPort(out int handle, string name, int maxSessions);
+        Result ConnectToPort(out int clientSessionHandle, int clientPortHandle);
+    }
+}