``` *gcodes*:: '(returns tuple of integers)' -
Active G-codes for each modal group.
G code constants
G_0, G_1, G_2, G_3, G_4, G_5, G_5_1, G_5_2, G_5_3, G_7, G_8, G_100, G_17,
G_17_1, G_18, G_18_1, G_19, G_19_1, G_20, G_21, G_28, G_28_1, G_30, G_30_1,
G_33, G_33_1, G_38_2, G_38_3, G_38_4, G_38_5, G_40, G_41, G_41_1, G_42, G_42_1,
G_43, G_43_1, G_43_2, G_49, G_50, G_51, G_53, G_54, G_55, G_56, G_57, G_58,
G_59, G_59_1, G_59_2, G_59_3, G_61, G_61_1, G_64, G_73, G_76, G_80, G_81, G_82,
G_83, G_84, G_85, G_86, G_87, G_88, G_89, G_90, G_90_1, G_91, G_91_1, G_92,
G_92_1, G_92_2, G_92_3, G_93, G_94, G_95, G_96, G_97, G_98, G_99```