Use double when handling qreal orient_

When the value of `orient_` crosses the boundary of `float`, e.g., when
`cmd_vel.angular.z = -4.0e+214`, `normalizeAngle` returns `nan`.
As a result, `x`, `y`, and `theta` all become `nan`, and turtle disappears
from the frame.

As `qreal` corresponds to `double`, `normalizeAngle` should be taking param
`angle` as `double`, and return `double` accordingly.

turtlesim/src/turtle.cpp

@@ -41,7 +41,7 @@
 namespace turtlesim
 {
 
-static float normalizeAngle(float angle)
+static double normalizeAngle(double angle)
 {
  return angle - (TWO_PI * std::floor((angle + PI) / (TWO_PI)));
 }
@@ -206,8 +206,8 @@ bool Turtle::update(double dt, QPainter& path_painter, const QImage& path_image,
  }
  else
  {
- float theta = normalizeAngle(rotate_absolute_goal_handle_->get_goal()->theta);
- float remaining = normalizeAngle(theta - static_cast<float>(orient_));
+ double theta = normalizeAngle(rotate_absolute_goal_handle_->get_goal()->theta);
+ double remaining = normalizeAngle(theta - static_cast<float>(orient_));
 
  // Update result
  rotate_absolute_result_->delta = normalizeAngle(static_cast<float>(rotate_absolute_start_orient_ - orient_));