Tests for project generation

[xorye]

• Make sure steps (1/6, 2/6, 3/6) in the wizard are correct.
• Make sure default values are correct. (title exists, prompt text exists, default groupID exists etc.)
• Make sure steps and values are correct after hitting the back button (difficult)
• Make sure input validation is working as expected.
• Make sure saving defaults work (have to make sure you don’t edit the current settings.json file)
• Make sure project downloads, contains launch.json and tasks.json in the artifactId/.vscode folder.

Testing would be easier if there was a way to fire events manually, and if there was a way to detect if a QuickInput is currently being displayed on the current window.

If not, we would need to test values before await calls that wait for user input.

[xorye]

Fixed with #172