[Suggestion] Autostart App ID through CLI Arg

[Blockmaster2706]

I want to suggest allowing a specific ID to be started automatically when Appload starts using a cli and/or config argument.

Benefit:

• Some people might only care (mostly) about a specific app, so this could save an extra tap to go from Appload to the app they want, while still allowing to exit that app manually and choose a different one
• When developing Appload Apps, this argument could be used so that Appload always loads into the app you're building, making reloads during development just ever so slightly less annoying

[asivery]

Added in d807aca