Daily update on 20250414-003153 by Nitload Youmu. Additional Message : Tech Issue: due to forbidden of multi-inheritance in C#, full ranslate fron EXPRESS to C# code is impossible, the EXPRESS interpreter in StgSharp will become a dialect

Add: A group of classes imported from lib https://github.com/ixmilia/step under MIT license, representing all STEP AP203 geometry objects
Change: many change to classes from https://github.com/ixmilia/step to link data interfaces to those in StgSharp
Freeze: implementation to StgSharp EXPRESS interpreter about collextion operation and element define grammer

Signed-off-by: Nitload <YoumuLiu_NSI@whv0t.onmicrosoft.com>

StgSharp.Script/Common/CompileStack.cs

@@ -42,6 +42,8 @@ namespace StgSharp.Script
         where TType: ITypeSource<TType>
     {
 
+        private Token? _lastToken;
+
         private TNode[] _nodeArray = new TNode[4];
         private Token[] _operatorArray = new Token[4];
         private Token[] _tokenArray = new Token[4];
@@ -51,6 +53,7 @@ namespace StgSharp.Script
 
         private Stack<bool> _isNode = new Stack<bool>();
         private Stack<Stack<TNode>> _statementCache = new Stack<Stack<TNode>>();
+        private TNode _lastNode;
 
         public CompileStack()
         {
@@ -58,6 +61,8 @@ namespace StgSharp.Script
             _statementCache.Push( new Stack<TNode>() );
         }
 
+        public bool IsLastAddedOperator { get; private set; }
+
         public CompileDepthMark CurrentDepthMark
         {
             get => _depthStack.Peek();
@@ -180,6 +185,7 @@ namespace StgSharp.Script
             _nodeArray[ _nodeCount ] = node;
             _nodeCount++;
             _isNode.Push( true );
+            IsLastAddedOperator = false;
         }
 
         public void PushOperand( Token token )
@@ -190,6 +196,7 @@ namespace StgSharp.Script
             _tokenArray[ _tokenCount ] = token;
             _tokenCount++;
             _isNode.Push( false );
+            IsLastAddedOperator = false;
         }
 
         public void PushOperator( Token token )
@@ -199,6 +206,7 @@ namespace StgSharp.Script
             }
             _operatorArray[ _operatorCount ] = token;
             _operatorCount++;
+            IsLastAddedOperator = true;
         }
 
         public T StateOfCurrentDepth<T>() where T: class, ICompileDepthState