Red code legacy MemoryManager, StreamEngine, ResourceManager, ImageHandler, AsyncPakManager, and more (#758)

Remove from CryCommon and CrySystem:
- MemoryManager and all related classes/files
- StreamEngine, ResourceManager, ImageHandler, and AsyncPakManager
- Various other related interfaces/files/classes etc. that are all now unused

Code/CryEngine/CryCommon/ISystem.h

@@ -65,12 +65,10 @@ struct IProcess;
 struct ITimer;
 struct ICryFont;
 struct IMovieSystem;
-struct IMemoryManager;
 namespace Audio
 {
     struct IAudioSystem;
 } // namespace Audio
-struct IStreamEngine;
 struct SFileVersion;
 struct INameTable;
 struct ILevelSystem;
@@ -78,7 +76,6 @@ struct IViewSystem;
 class ICrySizer;
 class IXMLBinarySerializer;
 struct IReadWriteXMLSink;
-struct IResourceManager;
 struct ITextModeConsole;
 struct IAVI_Reader;
 class CPNoise3;
@@ -89,7 +86,6 @@ struct ILZ4Decompressor;
 class IZStdDecompressor;
 struct IOutputPrintSink;
 struct IWindowMessageHandler;
-struct IImageHandler;
 
 namespace AZ
 {
@@ -828,10 +824,6 @@ struct ISystem
     virtual void DoWorkDuringOcclusionChecks() = 0;
     virtual bool NeedDoWorkDuringOcclusionChecks() = 0;
 
-    // Summary:
-    //   Returns the current used memory.
-    virtual uint32 GetUsedMemory() = 0;
-
     // Summary:
     //   Retrieve the name of the user currently logged in to the computer.
     virtual const char* GetUserName() = 0;
@@ -905,27 +897,18 @@ struct ISystem
     virtual ILevelSystem* GetILevelSystem() = 0;
     virtual INameTable* GetINameTable() = 0;
     virtual IValidator* GetIValidator() = 0;
-    virtual IStreamEngine* GetStreamEngine() = 0;
     virtual ICmdLine* GetICmdLine() = 0;
     virtual ILog* GetILog() = 0;
     virtual AZ::IO::IArchive* GetIPak() = 0;
     virtual ICryFont* GetICryFont() = 0;
-    virtual IMemoryManager* GetIMemoryManager() = 0;
     virtual IMovieSystem* GetIMovieSystem() = 0;
     virtual ::IConsole* GetIConsole() = 0;
     virtual IRemoteConsole* GetIRemoteConsole() = 0;
-    // Returns:
-    //   Can be NULL, because it only exists when running through the editor, not in pure game mode.
-    virtual IResourceManager* GetIResourceManager() = 0;
     virtual IProfilingSystem* GetIProfilingSystem() = 0;
     virtual ISystemEventDispatcher* GetISystemEventDispatcher() = 0;
 
     virtual ITimer* GetITimer() = 0;
 
-    virtual void DebugStats(bool checkpoint, bool leaks) = 0;
-    virtual void DumpWinHeaps() = 0;
-    virtual int DumpMMStats(bool log) = 0;
-
     // Arguments:
     //   bValue - Set to true when running on a cheat protected server or a client that is connected to it (not used in singleplayer).
     virtual void SetForceNonDevMode(bool bValue) = 0;
@@ -1166,8 +1149,6 @@ struct ISystem
     // Initializes Steam if needed and returns if it was successful
     virtual bool SteamInit() = 0;
 
-    virtual const IImageHandler* GetImageHandler() const = 0;
-
     // Summary:
     //      Gets the root window message handler function
     //      The returned pointer is platform-specific: