Add zoom option

[diedel]

It would be nice to add an option to zoom the MSX game viewport until the border is no longer visible. Like the C64 Vice or the P-UAE cores do.

Currently I play MSX games using 4:3 or 19:14 aspect ratio but still I miss some extra area that could be taken from the unused vertical borders.

[diedel]

I find out that setting "Crop Overscan ON" under Options makes the MSX playing area bigger.

[Darknior]

Thanks for the information, like you i like the ZOOM option on Amiga et C64 emulators to play in full screen :)