Motors cleanup (#192)

* refactoring

* moving chassis into separate project

* added set motors

libs/ev3/ns.ts

@@ -14,11 +14,16 @@ namespace sensors {
 }
 
 //% color="#A5CA18" weight=90 icon="\uf10d"
-//% groups='["Motion", "Sensors", "Chassis"]'
+//% groups='["Motion", "Counters", "Sync Motion"]'
 //% labelLineWidth=0
 namespace motors {
 }
 
+//% labelLineWidth=0
+namespace chassis {
+
+}
+
 //% labelLineWidth=0
 namespace behaviors {
 }