feat(tutoQml): add basic samples using qml interfaces

What does this MR do?

Add new samples to use Qml:

• Tuto01BasicQml: same as Tuto01Basic but using qml instead of fwGui frame and xml
• TutoGuiQml: same as TutoGui but using qml instead of fwGui frame and actions
• TutoEditorQml: sample to explain how to use a IQmlEditor

New library fwQml that contains helpers to use qml:

• IQmlEditor: base class for f4s service associated to qml UI
• QmlEngine: to launch qml ui

This MR is the second step of the Qml integration
See #2 (closed)
Related to !4 (merged) and !15 (merged)

Documentation

Wiki

How to test it?

• Launch Tuto01BasicQml, TutoGuiQml and see that they work as the related samples.
• Launch TutoEditorQml and test that when you edit one text area, the second is updated.

Data

No data are required.

Depends

• sight-deps!1
• !15 (merged)