Legacy cleanup, part 2 (#3659)

* Legacy cleanup, part 2

There are still things that can be removed, those will be likely done in part three:
`The Return of the Cleanup` :)

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Fix windows build

Somehow there were some unfixed errors from enabled warnings?
I'm unsure if I've pulled repo in unstable state, or those were somehow
missed.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Code/LauncherUnified/Launcher.h

@@ -10,7 +10,9 @@
 #include <AzCore/PlatformDef.h> // for AZ_COMMAND_LINE_LEN
 #include <AzCore/Debug/Trace.h>
 #include <AzCore/IO/SystemFile.h>
+#include <AzCore/Memory/Memory.h>
 #include <CryCommon/platform.h>
+#include <CryCommon/LegacyAllocator.h>
 
 struct IOutputPrintSink;
 
@@ -34,7 +36,7 @@ namespace O3DELauncher
 
 #define COMMAND_LINE_ARG_COUNT_LIMIT (AZ_COMMAND_LINE_LEN+1) / 2        // Assume that the limit to how many arguments we can maintain is the max buffer size divided by 2
                                                                         // to account for an argument and a spec in between each argument (with the worse case scenario being
-                                                                    
+
     struct PlatformMainInfo
     {
         typedef bool (*ResourceLimitUpdater)();
@@ -69,7 +71,7 @@ namespace O3DELauncher
 
         void* m_window = nullptr; //!< maps to \ref SSystemInitParams::hWnd
         void* m_instance = nullptr; //!< maps to \ref SSystemInitParams::hInstance
-        IOutputPrintSink* m_printSink = nullptr; //!< maps to \ref SSystemInitParams::pPrintSync 
+        IOutputPrintSink* m_printSink = nullptr; //!< maps to \ref SSystemInitParams::pPrintSync
     };
 
     enum class ReturnCode : unsigned char