Thread scheduler rewrite (#393)

* Started to rewrite the thread scheduler

* Add a single core-like scheduling mode, enabled by default

* Clear exclusive monitor on context switch

* Add SetThreadActivity, misc fixes

* Implement WaitForAddress and SignalToAddress svcs, misc fixes

* Misc fixes (on SetActivity and Arbiter), other tweaks

* Rebased

* Add missing null check

* Rename multicore key on config, fix UpdatePriorityInheritance

* Make scheduling data MLQs private

* nit: Ordering

Ryujinx.HLE/HOS/Kernel/KEvent.cs

@@ -1,4 +1,38 @@
 namespace Ryujinx.HLE.HOS.Kernel
 {
-    class KEvent : KSynchronizationObject { }
+    class KEvent : KSynchronizationObject
+    {
+        private bool Signaled;
+
+        public string Name { get; private set; }
+
+        public KEvent(Horizon System, string Name = "") : base(System)
+        {
+            this.Name = Name;
+        }
+
+        public override void Signal()
+        {
+            System.CriticalSectionLock.Lock();
+
+            if (!Signaled)
+            {
+                Signaled = true;
+
+                base.Signal();
+            }
+
+            System.CriticalSectionLock.Unlock();
+        }
+
+        public void Reset()
+        {
+            Signaled = false;
+        }
+
+        public override bool IsSignaled()
+        {
+            return Signaled;
+        }
+    }
 }