+ Updated top bar layout in respect to the mode
+ Linux specific: Don`t show down arrow for buttons with PopupMenu
+ MainFrame: Use TopBar instead wxBookCtrlBase
* Don't select "Printer" tab after printer technology change from selection in right panel
* Delete "Physical printer" tab after deletion last preset from physical printer
+ show_printer_webview_tab() is moved into MainFrame
+ TopBar: use AddNewPage and InsertNewPage as overridden functions for AddPage and InsertPage
* Don't set a bold font on hovered items
* Don't hover selected item
* Fixed position of popup menu
+ Fix for SPE-2235 : Hard to see the numbers of printers after a change of application color mode
+ Fixed build warning with AddPage()
Note: on Linux wxButton doesn't receive wxEVT_PAINT event, so we cant redraw it with rounded corners.
So, we just set related colors of back/foreground for the TopBar buttons.