Made the parser state dispose project declarations for removed projects.

Author: MDoerner

Rubberduck.Parsing/VBA/RubberduckParserState.cs

@@ -152,9 +152,22 @@ private void Sinks_ProjectRemoved(object sender, ProjectEventArgs e)
             }
 
             Debug.Assert(e.ProjectId != null);
+            DisposeProjectDeclarations(e.ProjectId);
+
             OnParseRequested(sender);
         }
 
+        private void DisposeProjectDeclarations(string projectId)
+        {
+            var projectDeclarations = DeclarationFinder.UserDeclarations(DeclarationType.Project)
+                .Where(declaration => declaration.ProjectId == projectId)
+                .OfType<ProjectDeclaration>();
+            foreach (var projectDeclaration in projectDeclarations)
+            {
+                projectDeclaration.Dispose();
+            }
+        }
+
         private void Sinks_ProjectRenamed(object sender, ProjectRenamedEventArgs e)
         {
             if (!_vbe.IsInDesignMode || !ThereAreDeclarations())