EQL5: QML/Lisp bridge (for desktop)

[PR]

For those interested in the progress of EQL5:

Two new modules have been added lately: "multimedia" and "quick".

The most interesting part is the QML / Lisp bridge, which allows
creating applications using only QML (declarative UI) and Lisp
(instead of JavaScript).

For examples of calling Lisp from QML, see:

https://gitlab.com/eql/EQL5/blob/master/examples/M-modules/quick/qml-lisp/qml/example.qml

For a working example (port of the QtQuick1 "Tic-Tac-Toe" example), see:

QML:
https://gitlab.com/eql/EQL5/blob/master/examples/M-modules/quick/Tic-Tac-Toe/qml/tic-tac-toe.qml

Lisp:
https://gitlab.com/eql/EQL5/blob/master/examples/M-modules/quick/Tic-Tac-Toe/game-logic.lisp

This is meant for desktop applications only (I don't have any
experience with mobile apps, and don't know the current state of the
android port).

Paul