Feat: new euclidean words and sugar for floating point numbers

tests/forth/arithmetic.rs

@@ -200,3 +200,13 @@ fn log_e() {
 fn log_one() {
     expect_int("1 log", 0);
 }
+
+#[test]
+fn shorthand_float() {
+    expect_float(".25 .5 +", 0.75);
+}
+
+#[test]
+fn shorthand_float_negative() {
+    expect_float("-.5 1 +", 0.5);
+}