* windowmanager destructor free _mainwindow, fix save - remove const in
settingsPath that is being written to from ptree tree
* syntax error
* remove destructor, _mainWindow does not need any special cleanup, let OS claim the resource
* nominmax
* windowmanager destructor free _mainwindow, fix save - remove const in
settingsPath that is being written to from ptree tree
* syntax error
* remove destructor, singleton, let OS claim the resource as no special cleanup of _mainWindow is not needed