Description

Clicking the tray icon should minimize the window (like other apps with systray support, such as Telegram).

This is not the same issue as having Nativefier minimize to tray after the window is closed (as in #97, #127 or #158), which already works. It's just annoying having to manually close the window.

Steps to reproduce issue

Open a website with --tray. You shoul

I couldn't load and build the project using the latest qt creator and the wiki guide for building, i think it's out dated, please update and add more details for beginners who want to contribute.

When the browser zoom level is not 100%, right clicking in the Blockly workspace opens the browser context menu on top of the Blockly context menu.
I'm on Ubuntu 16.04.5 with Chrome 72.0.3626.81, but have also seen the issue on macOS Sierra Version 10.12.6 with Chrome 75.0.3770.100. See gif below.

![ardublockly-bug](https://user-images.githubusercontent.com/6350840/60499787-0cd5e680-9cb1-11e9-