1.1.0

This release is mostly about fixing or circumventing bugs, especially with Qt6.

Main changes:

● A crash on pasting empty clipboard is fixed.
● A bug is fixed in updating widget states after deleting a node.
● Text zooming is fixed for documents that are saved by the Qt6 version.
● The text tab stop distance is corrected.
● A workaround has been added for a Qt6 bug that doesn't include newlines in the plain-text data of the copied text.
● Total node deselection is prevented with Qt6.
● The Unix signal handling is revamped.
● "Embed Image" is removed from the toolbar to make it uncluttered (it's till in the right-click and Format menus).
● The context menus and tooltips are corrected under Wayland.
● Simplified finding of Qt modules with cmake.
● Silenced the compilation warnings with Qt 6.4.