Add Windows export preset

[wjt]

Annoyingly this needed changes to the version-generator plugin, because
exporting generated this warning:

WARNING: Invalid version number "v0.1.11-72-g29be516f2". The version
number can only contain numeric characters (0-9) and non-consecutive
periods (.).

I changed it so that "application/config/version" is "0.1.12" for the
tag "v0.1.12", and "0.1.11.72" for a build 72 commits ahead of v0.1.11.
The full git describe --tags output is now in
"application/config/full_version".

Explicitly qualify the export name with "x86_64". It is possible we will
one day add an arm64 export. Update the Linux export accordingly. Ensure
the target directory exists for both builds

Resolves #2155

[github-actions]

Play this branch at https://play.threadbare.game/branches/endlessm/wjt/add-windows-export-preset/.

(This launches the game from the start, not directly at the change(s) in this pull request.)

[wjt]

I tested a build of this on my Asus E406 laptop (a relatively ancient Celeron from about 2018) running Windows 11. It works fine, except for some normal Windows stuff:

1. First “Smart App Control blocked an app that may be unsafe”. There was no way to skip this; I had to go to Windows Security and turn off Smart App Control.

2. Then “Microsoft Defender SmartScreen” was also sad about this unsigned app. Here I pressed “More info” and “Run anyway” to run it.

@JoniCeceri also tested a build of this preset on their Windows 11 system – also fine.