TK.1 TakeoffCraft: show lengths in meters, centimeters or millimeters

TakeoffCraft's own settings tab gets "Show lengths as": Follow Global (the metric length unit starred in Settings > Global > Units, else feet-inches), Feet-inches, m, cm or mm. It changes how lengths read on the sheet, in the status bar and in the panels, and the heights too: item height/depth, thickness, head, base and the Levels dialog; a bare number typed in a height field is read in the shown unit. The 1/16, 1/8 and 1/4 inch picker shows only for feet-inches. Display only: quantities, costs and exports still use the exact lengths. Asked for on Discord (a user could not find a meters option). Built in the a Discord member build, checked by syntax and number formatting; not yet tried in a browser.