Allow special characters in AnimGraph node group names

Relying on the command system's string processing syntax prevents certain
names from being used. This converts the AnimGraphAdjustNodeGroup command
to be directly invokable, so that arguments can be passed directly, instead
of going through the CommandLine string parsing.

Signed-off-by: Chris Burel <burelc@amazon.com>

Gems/EMotionFX/Code/MCore/Source/Command.cpp

@@ -28,10 +28,10 @@ namespace MCore
 
 
     // constructor
-    Command::Command(const char* commandName, Command* originalCommand)
+    Command::Command(AZStd::string commandName, Command* originalCommand)
+        : mOrgCommand(originalCommand)
+        , mCommandName(AZStd::move(commandName))
     {
-        mCommandName = commandName;
-        mOrgCommand  = originalCommand;
     }