[Pre-Port] Change toAscii > toLatin1

Forward compatible changes.
[Pre-Port] QPixmap for QIcon constructor

Forward compatible changes.
[Pre-Port] SetShown > SetVisible

Forward compatible changes
[Pre-port] Replace Qt allocation with stdlib

Forward compatible changes.
[Pre-port] Replace QAbstractItemModel::reset()

Forward compatible changes.

reset() was deprecated in lieu of beginResetModel() / endResetModel()