Increased size requirement for Steam assets

[2TallTyler]

@zephyris and I are working on an update to the Steam store assets, now that OpenGFX 2 Classic is shipped with the game instead of OpenGFX.

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Steam has updated their store asset sizes since we brought OpenTTD to Steam. From what I can tell, most have doubled in size. Ours continue to work, but if we're updating we need to follow the new sizes.

Here's an inventory of what we have:

Too small:

• Header Capsule: 920 x 430
• Small Capsule: 462 x 174
• Main Capsule: 1232 x 706
• Vertical Capsule: 748 x 896
• Library Hero: 3840 x 1240
• Library Logo: 1280 x 720

Missing:

• Library Header: 920 x 430

Correct size:

• Page Background: 1438 x 810, but ours is too busy IMO
• Library Capsule: 600 x 900

[zephyris]

There's a few key additional guidelines for the 'Small Capsule', 'Main Capsule' and 'Vertical Capsule' images - these are the key branding/advertising artworks which should have an easily readable game name and logo and consistent artwork styles.

Small Capsule

Main Capsule

Vertical Capsule

SVG sources available for all of them... edit: attached the svgs
CapsuleLogos.zip

I suggest these logo/textmarks with a relatively busy 2x zoom temperate screenshot (these screenshots are just placeholders edit: updated to use a half-decent screenshot) in the background.

And a quick mockup of how these (in this case, the 'Main Capsule' image) are used in the Steam App/on the Steam website in situ.