Add utility function and some minor cleanup/documentation

src/openrct2/Context.cpp

@@ -996,8 +996,7 @@ namespace OpenRCT2
 
         void RunFrame()
         {
-            const auto deltaTime = _timer.GetElapsedSeconds().count();
-            _timer.Restart();
+            const auto deltaTime = _timer.GetElapsedTimeAndRestart().count();
 
             // Make sure we catch the state change and reset it.
             bool useVariableFrame = ShouldRunVariableFrame();

src/openrct2/core/Timer.hpp

@@ -12,6 +12,9 @@
 
 namespace OpenRCT2
 {
+    /// <summary>
+    /// Restartable timer utility that starts at construction.
+    /// </summary>
     class Timer
     {
         using Clock = std::chrono::high_resolution_clock;
@@ -20,15 +23,32 @@ namespace OpenRCT2
         Timepoint _tp = Clock::now();
 
     public:
+        /// <summary>
+        /// Restarts the timer.
+        /// </summary>
+        /// <returns></returns>
         void Restart() noexcept
         {
             _tp = Clock::now();
         }
 
-        std::chrono::duration<float> GetElapsedSeconds() const noexcept
+        /// <summary>
+        /// Returns the amount of time in seconds since the last start.
+        /// </summary>
+        [[nodiscard]] std::chrono::duration<float> GetElapsedTime() const noexcept
         {
             return Clock::now() - _tp;
         }
+
+        /// <summary>
+        /// Returns the amount of time in seconds since the last start and restarts.
+        /// </summary>
+        [[nodiscard]] std::chrono::duration<float> GetElapsedTimeAndRestart() noexcept
+        {
+            const auto res = Clock::now() - _tp;
+            Restart();
+            return res;
+        }
     };
 
 } // namespace OpenRCT2

src/openrct2/network/DiscordService.cpp

@@ -75,7 +75,7 @@ void DiscordService::Tick()
 {
     Discord_RunCallbacks();
 
-    if (_updateTimer.GetElapsedSeconds() < REFRESH_INTERVAL)
+    if (_updateTimer.GetElapsedTime() < REFRESH_INTERVAL)
         return;
 
     RefreshPresence();