Implement a new physical memory manager and replace DeviceMemory (#856)

* Implement a new physical memory manager and replace DeviceMemory

* Proper generic constraints

* Fix debug build

* Add memory tests

* New CPU memory manager and general code cleanup

* Remove host memory management from CPU project, use Ryujinx.Memory instead

* Fix tests

* Document exceptions on MemoryBlock

* Fix leak on unix memory allocation

* Proper disposal of some objects on tests

* Fix JitCache not being set as initialized

* GetRef without checks for 8-bits and 16-bits CAS

* Add MemoryBlock destructor

* Throw in separate method to improve codegen

* Address PR feedback

* QueryModified improvements

* Fix memory write tracking not marking all pages as modified in some cases

* Simplify MarkRegionAsModified

* Remove XML doc for ghost param

* Add back optimization to avoid useless buffer updates

* Add Ryujinx.Cpu project, move MemoryManager there and remove MemoryBlockWrapper

* Some nits

* Do not perform address translation when size is 0

* Address PR feedback and format NativeInterface class

* Remove ghost parameter description

* Update Ryujinx.Cpu to .NET Core 3.1

* Address PR feedback

* Fix build

* Return a well defined value for GetPhysicalAddress with invalid VA, and do not return unmapped ranges as modified

* Typo

Ryujinx.Memory/MemoryPermission.cs

@@ -0,0 +1,46 @@
+using System;
+
+namespace Ryujinx.Memory
+{
+    /// <summary>
+    /// Memory access permission control.
+    /// </summary>
+    [Flags]
+    public enum MemoryPermission
+    {
+        /// <summary>
+        /// No access is allowed on the memory region.
+        /// </summary>
+        None = 0,
+
+        /// <summary>
+        /// Allow reads on the memory region.
+        /// </summary>
+        Read = 1 << 0,
+
+        /// <summary>
+        /// Allow writes on the memory region.
+        /// </summary>
+        Write = 1 << 1,
+
+        /// <summary>
+        /// Allow code execution on the memory region.
+        /// </summary>
+        Execute = 1 << 2,
+
+        /// <summary>
+        /// Allow reads and writes on the memory region.
+        /// </summary>
+        ReadAndWrite = Read | Write,
+
+        /// <summary>
+        /// Allow reads and code execution on the memory region.
+        /// </summary>
+        ReadAndExecute = Read | Execute,
+
+        /// <summary>
+        /// Allow reads, writes, and code execution on the memory region.
+        /// </summary>
+        ReadWriteExecute = Read | Write | Execute
+    }
+}