Add a property to the manifest to designate a component to launch on app startup

[tido64]

When the app manifest only contains a single component, the test app will try to launch it on startup. There is currently no way to launch an arbitrary component on startup when there are more than one.

[rohanprasadofficial]

@tido64 , any approach you have thought for this ?

[tido64]

Not really. So far, no one has asked for this so I'm not sure it's actually needed. We also recently added single-app mode which solves part of the issue.