devel/qschematic: New port: Qt/C++ library providing widgets for drawing diagrams

• submitter becomes maintainer

QSchematic is a C++ library providing Qt widgets to easily draw diagrams and
schematics in a Qt application. It uses Qt's graphics view framework.

The library interface allows for easy customization of existing items and adding
new custom items such as wires, nodes, connectors and similar.

Drawn diagrams/schematics can be easily serialized to and from XML. A built-in
netlist generator is provided to build a netlist form a drawn diagram/schematic.

WWW: https://github.com/simulton/qschematic

PR: 265449