removed unused Node classes

Author: retailcoder

RetailCoder.VBE/Rubberduck.csproj

@@ -316,15 +316,9 @@
     <Compile Include="UI\ToDoItems\IToDoExplorerWindow.cs" />
     <Compile Include="UnitTesting\ITestEngine.cs" />
     <Compile Include="UnitTesting\TestEngine.cs" />
-    <Compile Include="VBA\Nodes\OptionNode.cs" />
-    <Compile Include="VBA\Nodes\EnumNode.cs" />
     <Compile Include="VBA\Nodes\ProcedureNode.cs" />
-    <Compile Include="VBA\Nodes\ParameterNode.cs" />
-    <Compile Include="VBA\Nodes\TypeNode.cs" />
     <Compile Include="VBA\IRubberduckParser.cs" />
-    <Compile Include="VBA\Nodes\IdentifierNode.cs" />
     <Compile Include="VBA\Nodes\INode.cs" />
-    <Compile Include="VBA\Nodes\ModuleNode.cs" />
     <Compile Include="VBA\Nodes\Node.cs" />
     <Compile Include="VBA\RubberduckParser.cs" />
     <Compile Include="Config\IConfigurationService.cs" />

RetailCoder.VBE/VBA/Nodes/EnumNode.cs

@@ -5,6 +5,7 @@
 
 namespace Rubberduck.VBA.Nodes
 {
+    // todo: delete this obsolete interface
     public interface INode
     {
         /// <summary>

RetailCoder.VBE/VBA/Nodes/INode.cs

@@ -7,7 +7,7 @@
 namespace Rubberduck.VBA.Nodes
 {
     /// <summary>
-    /// The base class for all nodes in a Rubberduck code tree.
+    /// The base class for all nodes in a Rubberduck code tree. todo: delete this obsolete class.
     /// </summary>
     public abstract class Node : INode
     {

RetailCoder.VBE/VBA/Nodes/IdentifierNode.cs

@@ -7,6 +7,7 @@
 
 namespace Rubberduck.VBA.Nodes
 {
+    // todo: remove usages of this obsolete class.
     public class ProcedureNode : Node
     {
         public enum VBProcedureKind