Better QML Unittests

[JorisGoosen]

Ive merged the JASPFormTest and JASPQuickTest cause they were almost the same anyway.
Ive also moved DataSetProvider to QMLComponents so I can actually use it in the testcases.

[boutinb]

I have added QML Unit tests for VariablesList with a RowComponent, and ComponentsList with manual adding/removing rows.
For this, I had to add some javascript entries to some JASP controls.