Improve End GCode

Ensure we disable bed temp and turn off all fans.
Move the nozzle up by 0.5mm and retract to remove wipe on model top layer.

resources/definitions/eryone_thinker.def.json

@@ -60,7 +60,7 @@
             "default_value": "G21 ;metric values\nG90 ;absolute positioning\nM82 ;set extruder to absolute mode\nM107 ;start with the fan off\nG28 X0 Y0 ;move X/Y to min endstops\nG28 Z0 ;move Z to min endstops\nG1 Z10.0 F600 ;move the platform down 10mm\nG92 E0 ;zero the extruded length\nG1 F200 E3 ;extrude 3mm of feed stock\nG92 E0 ;zero the extruded length again\nG1 Y-3 F1200 ;move to prime\nG1 X10 F1200 ;\nG1 Z0.1 F600 ;get ready to prime\nG1 X120 E15 F1200 ;prime nozzle \nG1 X120 F3600 ;quick wipe\nG92 E0 ;zero the extruded length\nG5 ;enable resume from power failure\nM117 Printing..." 
         },
         "machine_end_gcode": { 
-            "default_value": "M104 S0\nM140 S0 ;Retract the filament\nG92 E1\nG1 E-5 F300\nG90 ;absolute positioning\nG1 X0 Y250 F4800 ; position for easy part removal\nM84 ;steppers off" 
+            "default_value": "M104 S0 ;turn off extruder\nM140 S0 ;turn off bed\nM107 ;turn off all fans\nG91 ;relative positioning\nG1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure\nG1 E-5 F300\nG1 Z+0.5 E-5 ;move Z up a bit and retract filament even more\nG90 ;absolute positioning\nG1 X0 Y250 F4800 ; position for easy part removal\nM84 ;steppers off" 
         },
         "acceleration_enabled": {
             "value": true