Hide fake instance creation in GUI

[HebaruSan]

Problem

Users somewhat frequently ask why they get an error when they try to launch the game for a fake instance (see #2665):

• Can't launch game without installing it #2850
• Bug to launch a fake KSP instance #3177
• game instances #3658
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Cause

These are created via the "Fake new KSP instance" option:

I think we added this on the general principle that features should be available in CmdLine, ConsoleUI, and GUI when possible. But creating a non-functional game folder is not something that normal users need to do, and its availability causes confusion. Some seem to assume they can make it install an arbitrary game version, without considering why the option they're clicking on says "fake".

Changes

Now instance faking is removed from GUI. The dropdown in Manage Game Instances now says "Clone instance" (translation updates attempted) and is disabled if no instance is selected in the grid:

Once you select an instance, it's enabled:

If you click it, the dialog appears, with all of the UI elements associated with "fake" removed:

The instance in the dropdown will match the row you selected in Manage Game Instances but can still be changed.

This should more firmly guide users towards cloning (which is useful to them) and away from faking (which is not). It also conveniently sidesteps the need to create faking functionality for KSP2 in GUI (which doesn't have KSP1's DLCs, meaning a more complex UI would be needed). The ckan instance fake command is still available for expert users and CI/CD, and has not been changed.

[techman83]

Looks nice and clean, this has been a common source of confusion, so I'm super glad to see it cleaned up.