Provide a Thymio launcher

Created by: stephanemagnenat

We wish to provide a Thymio launcher dialogue box. This box should provide access to:

• Studio with a default connection to local Thymio (serial or simulated), or if none or multiple available a Thymio-only result of discovery.
• Thymio VPL standalone with a similar connection option.
• Blockly and Scratch (through webbridge, hidden from the end user).
• Thymio wireless configurator.
• Thymio firmware upgrader.

Also, it would be helpful to have access to the following elements:

• Web site or documentation.
• Email registration.
• Credits and partnerships.

There are several design questions to address:

1. The first key question is whether this launcher should show a list of robots first (as in the example of Christophe in #694 (closed)), or a list of tools first (as currently in the system start menus).
2. How to visually split the main programs (Studio, VPL, Blockly, Scratch) and the tools (wireless configurator, upgrader).
3. Whether this launcher should check if a serial-connected Thymio requires upgrade.
4. Whether the launcher should check Aseba version and provide information to the user, and later automatic Aseba upgrade.