First pass FBX -> Scene File conversion. (#1699)

This is the simple pass, minimizing code changes and focused on comments.

Signed-off-by: stankowi <4838196+AMZN-stankowi@users.noreply.github.com>

Gems/EMotionFX/Code/Tests/UI/CanUseFileMenu.cpp

@@ -249,7 +249,7 @@ namespace EMotionFX
             LoadActor(actorFilename.toUtf8().data(), false);
             ASSERT_EQ(EMotionFX::GetActorManager().GetNumActorInstances(), 2) << "Failed to merge Actor.";
 
-            // We can't test Save Selected Actor as we would it would involve mocking fbx scene handling.
+            // We can't test Save Selected Actor as we would it would involve mocking source scene handling.
 
             // Add the filename to the recent actorsa anyway, so we can test that functionality.
             EMStudio::GetMainWindow()->AddRecentActorFile(actorFilename);
@@ -634,7 +634,7 @@ namespace EMotionFX
             motionSet->SetFilename(motionsetFilename.toUtf8().constData());
             motionSet->SetDirtyFlag(true);
 
-            // Don't create an actor or motion as we can't save that due to fbx scene requirements.
+            // Don't create an actor or motion as we can't save that due to source scene requirements.
 
             EMStudio::Workspace* workspace = EMStudio::GetManager()->GetWorkspace();
             const QString workspaceFilename = GenerateTempWorkspaceFilename();