Turn ratio field editor (#225)

* Turn ratio field editor (initial draft)

* Add field turn ratio editor

* Fix arrow rotation

* Fix left and right direction, remove unnecessary SVG circles.

* Update UI a little. add marker.

* updated math for turnratio angle

* slightly cuter

* cleanup

* consistent naming

* more cleanup

* fixing motor node issue

* updated package version

sim/state/motornode.ts

@@ -40,6 +40,10 @@ namespace pxsim {
         }
 
         setSpeedCmd(cmd: DAL, values: number[]) {
+            if (this.speedCmd != cmd ||
+                JSON.stringify(this.speedCmdValues) != JSON.stringify(values))
+                this.setChangedState();    
+            // new command TODO: values
             this.speedCmd = cmd;
             this.speedCmdValues = values;
             this.speedCmdTacho = this.angle;