Removed SignedRound and replaced std::round with std::lround where needed

Also see https://clang.llvm.org/extra/clang-tidy/checks/bugprone/incorrect-roundings.html

Signed-off-by: Alexander Borsuk <me@alex.bio>

platform/distance.cpp

@@ -6,6 +6,8 @@
 
 #include "base/assert.hpp"
 
+#include <cmath>
+
 namespace platform
 {
 using namespace measurement_utils;