Determine the Soldiers At War palette

This commit also takes the first step towards making it configurable;
override `internal/palettes.DefaultPaletteName` at build time to choose
one palette over another. It would be nice to set this at runtime!

cmd/palette-idx/main.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"strconv"
 
-	"code.ur.gs/lupine/ordoor/internal/data"
+	"code.ur.gs/lupine/ordoor/internal/palettes"
 )
 
 func main() {
@@ -13,11 +13,11 @@ func main() {
 	case "index", "i":
 		idx, err := strconv.ParseInt(os.Args[2], 16, 64)
 		if err != nil {
-			fmt.Println("Usage: palette-idx i <0-255>")
+			fmt.Println("Usage: palette-idx index <0-255> <name>")
 			os.Exit(1)
 		}
 
-		fmt.Printf("Palette[%v]: %#v\n", idx, data.ColorPalette[idx])
+		fmt.Printf("%vPalette[%v]: %#v\n", os.Args[3], idx, palettes.Palettes[os.Args[3]][idx])
 	case "color", "colour", "c":
 		fmt.Println("TODO!")
 		os.Exit(1)