Tune intaking and add support for picking up off the back

We now have a sequence of buttons which can be used to pick a disc up
off the back of the bot at the start of the match.  That needs to be
converted to be autonomous.

Change-Id: I19d01a785f95182349722081e610ae303807a441
diff --git a/y2019/wpilib_interface.cc b/y2019/wpilib_interface.cc
index 2efb55b..193aaa9 100644
--- a/y2019/wpilib_interface.cc
+++ b/y2019/wpilib_interface.cc
@@ -359,7 +359,7 @@
   void set_intake_roller_talon(
       ::std::unique_ptr<::ctre::phoenix::motorcontrol::can::TalonSRX> t) {
     intake_rollers_talon_ = ::std::move(t);
-    intake_rollers_talon_->ConfigContinuousCurrentLimit(20.0, 0);
+    intake_rollers_talon_->ConfigContinuousCurrentLimit(10.0, 0);
     intake_rollers_talon_->EnableCurrentLimit(true);
   }