Support HW serial in v5, clean up config

src/modules/illumination/illumination.cpp

@@ -9,11 +9,10 @@
 
 #define PWM_NUM 1
 #define WIRING_PWM_LEDS {25}
-//TODO: implement some fancier features of TMC controllers
+
 const uint8_t pwm_led_pins[] = WIRING_PWM_LEDS;
 void illumination_pwm_freq(String command)
 {
-    //TODO: make this properly, this is just a test for hacked on/off
     char * args[1];
     parse_arguments(args, command, 2);
     #ifdef MCU_PICO