fabs instead of abs

AutonomousMode/ControlModule/control_module.cpp

@@ -110,5 +110,5 @@ double ControlModule::ratio(double angle)
     double progressPercent = progress/angularRange;
 
     double speed = minAngularSpeed + progressPercent*speedRange;
-    return abs(speed);
+    return std::fabs(speed);
 }

AutonomousMode/ControlModule/control_module.h

@@ -2,6 +2,7 @@
 #include <mutex>
 #include <vector>
 #include <iostream>
+#include <cmath>
 
 class ControlModule
 {