Use ReadQueue for PhotonCamera timestamps (#1316)

This removes the extra GetLastChange call to keep everything properly
atomic.

Closes #1303

photon-targeting/src/main/native/include/photon/estimation/OpenCVHelp.h

@@ -51,6 +51,7 @@ static std::vector<cv::Point2f> GetConvexHull(
   return convexPoints;
 }
 
+[[maybe_unused]]
 static cv::RotatedRect GetMinAreaRect(const std::vector<cv::Point2f>& points) {
   return cv::minAreaRect(points);
 }
@@ -120,6 +121,7 @@ static std::vector<cv::Point3f> RotationToRVec(
   return cv::boundingRect(points);
 }
 
+[[maybe_unused]]
 static std::vector<cv::Point2f> ProjectPoints(
     const Eigen::Matrix<double, 3, 3>& cameraMatrix,
     const Eigen::Matrix<double, 8, 1>& distCoeffs,

photon-targeting/src/main/native/include/photon/estimation/VisionEstimation.h

@@ -32,6 +32,7 @@
 namespace photon {
 namespace VisionEstimation {
 
+[[maybe_unused]]
 static std::vector<frc::AprilTag> GetVisibleLayoutTags(
     const std::vector<PhotonTrackedTarget>& visTags,
     const frc::AprilTagFieldLayout& layout) {