remove code used for cannon in EV3Helper.java
remove code used for cannon in EV3Helper.java

magnusbae/LejosWebSockets,Itera/HelloBrick,magnusbae/LejosWebSockets,magnusbae/ThreadedLejosSumoBot,magnusbae/fluffy-meow,Itera/HelloBrick,magnusbae/lejos-ev3-remote-controlled-robot,follan/HelloBrick,andybb/HelloBrick