Github development has switched to the master branch

[jamespetts]

As information for all of those who compile from source or contribute to the code: development has now switched from the devel-new-2 branch to the master branch.

The master branch was formerly reserved for releases of Simutrans-Experimental (when Simutrans-Extended was so called), but having moved to an early access model of development with nightly builds, it seems more apposite to use the master branch for the main development, releases being demarked with tags.

[Ves]

Wow, there have indeed been quite some process since the last Experimental release!

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