Better process implementation (#491)

* Initial implementation of KProcess

* Some improvements to the memory manager, implement back guest stack trace printing

* Better GetInfo implementation, improve checking in some places with information from process capabilities

* Allow the cpu to read/write from the correct memory locations for accesses crossing a page boundary

* Change long -> ulong for address/size on memory related methods to avoid unnecessary casts

* Attempt at implementing ldr:ro with new KProcess

* Allow BSS with size 0 on ldr:ro

* Add checking for memory block slab heap usage, return errors if full, exit gracefully

* Use KMemoryBlockSize const from KMemoryManager

* Allow all methods to read from non-contiguous locations

* Fix for TransactParcelAuto

* Address PR feedback, additionally fix some small issues related to the KIP loader and implement SVCs GetProcessId, GetProcessList, GetSystemInfo, CreatePort and ManageNamedPort

* Fix wrong check for source pages count from page list on MapPhysicalMemory

* Fix some issues with UnloadNro on ldr:ro

Ryujinx.HLE/HOS/Kernel/KSlabHeap.cs

@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.HOS.Kernel
+{
+    class KSlabHeap
+    {
+        private LinkedList<ulong> Items;
+
+        public KSlabHeap(ulong Pa, ulong ItemSize, ulong Size)
+        {
+            Items = new LinkedList<ulong>();
+
+            int ItemsCount = (int)(Size / ItemSize);
+
+            for (int Index = 0; Index < ItemsCount; Index++)
+            {
+                Items.AddLast(Pa);
+
+                Pa += ItemSize;
+            }
+        }
+
+        public bool TryGetItem(out ulong Pa)
+        {
+            lock (Items)
+            {
+                if (Items.First != null)
+                {
+                    Pa = Items.First.Value;
+
+                    Items.RemoveFirst();
+
+                    return true;
+                }
+            }
+
+            Pa = 0;
+
+            return false;
+        }
+
+        public void Free(ulong Pa)
+        {
+            lock (Items)
+            {
+                Items.AddFirst(Pa);
+            }
+        }
+    }
+}