Provide current GUIs for hi-res games

[stickgrinder]

Dependencies

This issue follows #373
This issue precedes #258

Benefit description

Currently, Popochiu doesn't provide usable GUIs for high-resolution games. The experimental scaling is sub-optimal for those who want a high-res visual rendition, and it requires some trickery at runtime.

Those who want to create a high-resolution game should be able to have at least a valid version of the SimpleClick GUI at their service (see #373).

Despite the 9-Verbs (Lucas) and the Icon-Bar (Sierra) interfaces are probably bound to be used in retro-inspired games only, should providing a high-resolution friendly version of both is feasible with a reasonable effort, they have to be considered in the scope of this issue.

Solution description

• A high-resolution theme for the GUIs must be provided, as neutral as the ones we have already available
• High-resolution icons and assets have to be created. We can take inspiration from SimpleClick GUI improvements #373 or from the current icons, or again design a set of new assets that play well with Popochiu
• We must select one or more fonts to distribute with high-res GUI templates.
• These GUIs have to be made available for selection in the setup window (see Improve UX for the Game Setup window #258, which is related to this).

Exclusions

Since #258 will be included in 2.1 alongside the new high-res GUIs, this issue will NOT include big changes to the setup window. We can still take inspiration from the "custom" step detailed in #258 and rearrange the icon to select the GUI on two rows in the current setup window, removing the wall-of-text for description.

The best option is any way to keep this issue cleanly separated from #258.