Remove unused CaretAwareUndoableEdit class

It seems this class has been unused since the switch to RSyntaxTextArea
was made.

app/src/processing/app/CaretAwareUndoableEdit.java

@@ -1,77 +0,0 @@
-package processing.app;
-
-import processing.app.syntax.SketchTextArea;
-
-import javax.swing.undo.CannotRedoException;
-import javax.swing.undo.CannotUndoException;
-import javax.swing.undo.UndoableEdit;
-
-public class CaretAwareUndoableEdit implements UndoableEdit {
-
-  private final UndoableEdit undoableEdit;
-  private final int caretPosition;
-
-  public CaretAwareUndoableEdit(UndoableEdit undoableEdit, SketchTextArea textArea) {
-    this.undoableEdit = undoableEdit;
-    this.caretPosition = textArea.getCaretPosition();
-  }
-
-  @Override
-  public void undo() throws CannotUndoException {
-    undoableEdit.undo();
-  }
-
-  @Override
-  public boolean canUndo() {
-    return undoableEdit.canUndo();
-  }
-
-  @Override
-  public void redo() throws CannotRedoException {
-    undoableEdit.redo();
-  }
-
-  @Override
-  public boolean canRedo() {
-    return undoableEdit.canRedo();
-  }
-
-  @Override
-  public void die() {
-    undoableEdit.die();
-  }
-
-  @Override
-  public boolean addEdit(UndoableEdit undoableEdit) {
-    return this.undoableEdit.addEdit(undoableEdit);
-  }
-
-  @Override
-  public boolean replaceEdit(UndoableEdit undoableEdit) {
-    return this.undoableEdit.replaceEdit(undoableEdit);
-  }
-
-  @Override
-  public boolean isSignificant() {
-    return undoableEdit.isSignificant();
-  }
-
-  @Override
-  public String getPresentationName() {
-    return undoableEdit.getPresentationName();
-  }
-
-  @Override
-  public String getUndoPresentationName() {
-    return undoableEdit.getUndoPresentationName();
-  }
-
-  @Override
-  public String getRedoPresentationName() {
-    return undoableEdit.getRedoPresentationName();
-  }
-
-  public int getCaretPosition() {
-    return caretPosition;
-  }
-}