We need to track users that export their projects from playground and opens them in CLI or Sidekick. To support that we introduce playground key in nativescript key in package.json file. For example:
```
{
	"nativescript": {
		"playground": {
			"id": "some user quid",
			"usedTutorial": false // is not obligatory. In case it is present, can be true or false
		}
	}
}
```

If  case when package.json file contains playground key, {N} CLI reads playground data and saves them in userSettings file. If usedTutorial=true is already saved in userSettings file, {N} CLI does not overwrite it. After that {N} CLI deletes playground key from package.json file.

In case when package.json file does not contain playground key, {N} CLI checks if playground key is already saved in userSettings file. It this is the case, {N} CLI reads playground data from userSettings file.

In case project template has a preconfigured plugins data (for example API keys), it will be stored in the template's package.json.
After creating the project, CLI removes all keys except the one defined in `PackageJsonKeysToKeep` array from `app/package.json` file.
So it removes the predefined configuration of the pluginData.
Fix this by adding the entry "pluginsData" in the array, so we'll keep it as well.

Update version.
Update Changelog.