继续按 align-linuxcnc 约束：补表达式运算源码回归

tests/gcode/linuxcnc_expression_operators.ngc

@@ -0,0 +1,11 @@
+G21 G90
+#1 = [-7 mod 5]
+#2 = [2 ** 3 * 2]
+#3 = [[1 and 0] or [0 xor 2]]
+#4 = [[1 lt 2] and [2 ge 2] and [3 ne 4] and [4 eq 4]]
+G0 X#1 Y#2 Z#3 A#4
+#5 = [7 + 3 * 2 ** 2]
+#6 = [[5 mod 2] + [-5 mod 2]]
+#7 = [[2 gt 3] or [3 le 3]]
+G0 B#5 C#6 U#7
+M2