* Extend QTreeWidget implementation
* Added more QTreeWidget and QTreeWidgetItem APIs
Supports itemClicked and itemChanged events and several APIs to be able to edit columns of the QTreeWidgetItem
* Incorporate suggested changes
* Implemented all QTreeWidget signals
* fix currentItem
* lint fix
Co-authored-by: Atul R <atulanand94@gmail.com>
* 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
