name clash between color tan and math tan

[ds26gte]

starter2024.arr, unlike essentials*.arr, defines tan as num-tan. color.arr defines tan as color(210, 180, 140, 1).

Since starter2024.arr is the default context now, including anything that includes color.arr, as in some of the chart tests, creates a clash.

Hopefully this is the only tricky pair of homonyms...