Embedded Server Port: Environment Variable

[dasgarner]

Is your feature request related to a problem? Please describe.
When running more that one Player on the same PC (for example if you have a central server which runs many players), it is difficult to automate the deployment of players because the embedded server port has to be different for each instance of the Player.

It can be done by having the server port override on the Display - but that is hard to automate.

Describe the solution you'd like
An environment variable which can be passed at launch time which overrides the configured embedded web server port.