* Add `clearFocus()` to `QWidget`
* Add `Alignment` param to `QBoxLayout.addWidget()`
* Add `setViewportMargins()` & `viewportMargins()` to `QScrollArea`
* Add `QEvent` methods to all event related subclasses
* Tell C++ that our 0 is zero and not a null pointer
* Added the beginning of QTreeWidget and QTreeWidgetItem
* Fixed garbage collection
* Fixed garbage collection
* Rewrote the constructor for QTreeWidgetItem
* Code cleanup
* Fixed up the QTreeWidgetItem constructor to accept only a string list of columns. Code cleanup
* Add setHeaderHidden to QTreeWidget
* Started adding signals to QTreeWidget
* Started adding signals to QTreeWidget
* Started adding signals to QTreeWidget
* Added TreeWidget back to main.cpp
* Added more functions to QTreeWidgetItem and QPlainTextEdit
* linting and cleanup
* parenting fix
* Fixes garbage collection for treewidget items