v1.25.15

Publish a Tp-Note installer package for Windows 11

This release upgrades the Windows installer tool chain. The published Windows
installer package (`tpnote-1.25.15-x86_64.msi`) is tested with Windows 11 and is
probably the first working Tp-Note installer package for this Windows version.

The new installer also sets sub-entries to the context menu that appears when
you right-click on a file, a directory, the desktop or on the file explorer's
background. First, click on "Show more options" and then on one of the
following: "New Tp-Note", "Open", "View Tp-Note" or "Export Tp-Note".