Pulling updates from master (#951)

* show ports on start

* don't run show ports automatically

* polarity in synched motor (#945)

* account for polarity

* more comments

* handle dual motor in runtime

* invert steer

* don't use firmware polarity

* add block to stop program (#943)

* add block to stop program

* renaming

* fix translation

libs/ev3/ns.ts

@@ -1,6 +1,6 @@
 
 //% color="#68C3E2" weight=100 icon="\uf106"
-//% groups='["Buttons", "Screen", "Battery"]'
+//% groups='["Buttons", "Screen", "Power"]'
 //% labelLineWidth=60
 namespace brick {
 }