0024830: Remove redundant keyword 'mutable' in CDL declarations

Redundant keyword 'mutable' removed in CDL files.
In IGESConvGeom_GeomBuilder, unused methods MakeXY() and MakeXYZ() removed.
Method StepAP214_AutoDesignGroupAssignment::Init() replicating same method of the base class is removed as it causes CDL extraction error after above (seemingly irrelevant) changes.

src/TransferBRep/TransferBRep.cdl

@@ -58,7 +58,7 @@ is
     --           Transfer of an entity. I.E. in the binder bound to that Entity
     --           If no result or result not a single Shape, returns a Null Shape
 
-    SetShapeResult (TP : mutable TransientProcess from Transfer; ent : Transient;
+    SetShapeResult (TP : TransientProcess from Transfer; ent : Transient;
     	    	    result : Shape from TopoDS);
     ---Purpose : Sets a Shape as a result for a starting entity <ent>
     --           (reverse of ShapeResult)

src/TransferBRep/TransferBRep_BinderOfShape.cdl

@@ -36,10 +36,10 @@ raises TransferFailure
 
 is
 
-    Create returns mutable BinderOfShape;
+    Create returns BinderOfShape;
     ---Purpose : normal standard constructor, creates an empty BinderOfShape
 
-    Create (res : any Shape from TopoDS) returns mutable BinderOfShape;
+    Create (res : any Shape from TopoDS) returns BinderOfShape;
     ---Purpose : constructor which in the same time defines the result
 
 --    IsMultiple (me) returns Boolean;

src/TransferBRep/TransferBRep_ShapeBinder.cdl

@@ -28,10 +28,10 @@ raises TypeMismatch from Standard
 
 is
 
-    Create returns mutable ShapeBinder;
+    Create returns ShapeBinder;
     ---Purpose : Creates an empty ShapeBinder
 
-    Create (res : Shape) returns mutable ShapeBinder;
+    Create (res : Shape) returns ShapeBinder;
     ---Purpose : Creates a ShapeBinder with a result
 
     ShapeType (me) returns ShapeEnum;

src/TransferBRep/TransferBRep_ShapeListBinder.cdl

@@ -32,10 +32,10 @@ raises TypeMismatch, OutOfRange
 
 is
 
-    Create returns mutable ShapeListBinder;
+    Create returns ShapeListBinder;
 
-    Create (list : mutable HSequenceOfShape from TopTools)
-    	 returns mutable ShapeListBinder;
+    Create (list : HSequenceOfShape from TopTools)
+    	 returns ShapeListBinder;
 
     IsMultiple (me) returns Boolean  is redefined;
     -- returns True if more than one result