Added 2x zoom option for high resolution screens.

New options are:

A - automatic zoom when vertical pixels > 1300 
x2 - always x2 zoom (forcing x2 on low res screen might push part of the play area out of screen)
x1 - always x1 zoom

Also OldSkool mode in windowed mode is never x2

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Crash bug fix: previous version would crash if you tried to reselect controller NONE - with no other options available