v2.4
This release further simplifies the visual layout of 2-button chords.
It uses the current popular convention of showing a 4x3 grid with an anchor button in the top row.
The README.md has been updated to describe the visual chord layout.
Changes in this release:
- View | Show chords: show the anchor key in the top row of each 2-button chord grid.
- use Java properties file to hold the version number