Add: Announcement post for 15.1

[2TallTyler]

Let's do another release.

Words are hard, suggestions welcome.

Note: This is waiting on OpenTTD/OpenTTD#15146 to be merged and backported.

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Long news:

Brr, it's cold out, especially in the subarctic climate where we've been testing some snowy bugfixes.

Yes, it's time for a bug fixing release, OpenTTD 15.1. The list of fixes include:

* Trees grow on partially-snowy tiles again
* Town cargo graphs show correct dates
* The online content list no longer loses name and version at some font sizes
* A variety of other bugfixes, including a critical security fix; see the full changelog for more details

Full news: https://www.openttd.org/news/2026/01/24/openttd-15-1

Short news:

OpenTTD 15.1 now available on Steam / our website, fixing some snowy bugs.
https://www.openttd.org/news/2026/01/24/openttd-15-1

News-15.1.zip

[PeterN]

This is not quite right. If your new game settings were to enable infinite water, then that would be used for heightmaps too. So the fix allows this to be turned on and off in the right place, rather than "can be loaded with" :)

[PeterN]

Although we don't have the CVE number yet, we should have something more prominent for the security fixes (all script related)