CheapTRONIC v2.0 additions/revisions

Based on #9030

Marlin/src/pins/pins_CHEAPTRONICv2.h

 #define TEMP_0_PIN         15
 #define TEMP_1_PIN         13
 #define TEMP_2_PIN         14
-#define TEMP_3_PIN         11
+#define TEMP_3_PIN         11   // should be used for chamber temperature control
 #define TEMP_BED_PIN       12
 
 //
 //
 // Other board specific pins
 //
+#define FIL_RUNOUT_PIN     37   // board input labeled as F-DET
+#define Z_MIN_PROBE_PIN    36   // additional external board input labeled as E-SENS (should be used for Z-probe)  
 #define LED_PIN            13
-#define SPINDLE_ENABLE_PIN  4
+#define SPINDLE_ENABLE_PIN  4   // additional PWM pin 1 at JP1 connector - should be used for laser control too
+#define EXT_2               5   // additional PWM pin 2 at JP1 connector
+#define EXT_3               2   // additional PWM pin 3 at JP1 connector
 #define FAN_PIN             3
+#define FAN2_PIN           58   // additional fan or light control output
 #define PS_ON_PIN          45
 #define KILL_PIN           46
 
 #ifndef FILWIDTH_PIN
-  #define FILWIDTH_PIN     37   // should be Analog Input (0-15)
+  #define FILWIDTH_PIN     11   // shared with TEMP_3 analog input
 #endif