Add 'auto start' option

[zaneduffield]

Firstly, thanks for this tool! It works very well for me.

This change is simple enough. I wanted an option to have the game automatically started when the form is opened, to save having to click the 'Start' button. This means I can add this program as a custom 'game' with steam and launch the game with patches directly.

[zaneduffield]

This addresses #100

[rodrigomeireles]

@uberhalit would you please look at this? It looks good and it's old here.