Better management of common parameter (Use command line argument when possible)

[itfranck]

This apply for #134 (Size / Position) but also for pre-existing commands such as Start Minimized / Maximized / Start URL, etc...

Currently, we use $Driver.Manage to do these things.
However, I think this could be improved by using command line arguments behind the scene (when supported)

This will change the current behavior from supported command from :

1. Browser open
2. Something happen (Start URL is set, position is set, size is set, state is set)

to :

1. Browser open with the correct URL, position, size and state

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Browser that have command line argument to support the enhanced behavior will be modifed.
Remaining browsers will continue to use the Selenium "manage" way.

[itfranck]

Looks like it is mostly already the case. I'll keep that task open for the next day while I take some time to review.