* WIP: qmainwindow example
* NEW: option to disable acrylic on QMainWindow
* IMP: accept standard QMainWindow parameters
* NEW: enable acrylic in QMainWindow example
* IMP: qmainwindow sets acrylic outside constructor
* IMP: center windowTitle
* cleanup
* IMP: move setContentMargin in QtAcrylicMainWIndow class
* more cleanup
* small cleanup
* improvement copied from qtacrylicwidget
* minor improvement
* always connect needRepaint
* close button thickness is now similar to native windows buttons
* add context menu on left icon
* simpler context menu implementation
* IMP: use displaySystemMenu from Utilities
Co-authored-by: Julien Maille <julien.maille@data-pixel.com>
Julien
Yuhang Zhao