ksys: Add Timer (header only for now)

src/KingSystem/System/CMakeLists.txt

@@ -15,4 +15,6 @@ target_sources(uking PRIVATE
   StringBoard.h
   SystemPauseMgr.cpp
   SystemPauseMgr.h
+  Timer.cpp
+  Timer.h
 )

src/KingSystem/System/Timer.cpp

@@ -0,0 +1 @@
+#include "KingSystem/System/Timer.h"

src/KingSystem/System/Timer.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <basis/seadTypes.h>
+
+namespace ksys {
+
+struct Timer {
+    Timer() = default;
+    Timer(f32 value, f32 previous_value, f32 speed = -1.0)
+        : value(value), previous_value(previous_value), speed(speed) {}
+
+    void reset(f32 value_, f32 speed_ = -1.0) {
+        value = previous_value = value_;
+        speed = speed_;
+    }
+
+    void update();
+    static void update(f32& t);
+    bool hasEnded(f32 end_time) const;
+
+    f32 value{};
+    f32 previous_value{};
+    f32 speed{};
+};
+
+}  // namespace ksys