Use functions for logging load & save game times (#328)

Less copy and paste. Allows these very simple timings to be logged from elsewhere as well.

Ja2/TimeLogging.cpp

@@ -0,0 +1,72 @@
+#include "TimeLogging.h"
+#include "time.h"
+#include <stdio.h>
+
+
+clock_t starttime;
+clock_t t0;
+clock_t t1;
+FILE* fp_timelog = nullptr;
+
+
+static void indent(int n)
+{
+	for (int i = 0; i < n; i++)
+		fputc('\t', fp_timelog);
+}
+
+void TimingLogInitialize(const CHAR8* filename)
+{
+	starttime = clock();
+	t1 = starttime;
+
+	if (!fp_timelog)
+	{
+		fp_timelog = fopen(filename, "a");
+	}
+}
+
+
+void TimingLog(const CHAR8* logEvent, int n)
+{
+	if (fp_timelog)
+	{
+		t0 = t1;
+		t1 = clock();
+		fprintf(fp_timelog, "%s", logEvent);
+		indent(n);
+		fprintf(fp_timelog, ": %f s\n", ((float)(t1 - t0) / CLOCKS_PER_SEC));
+	}
+}
+
+
+void TimingLogTotalTime(const CHAR8* logEvent, int n)
+{
+	if (fp_timelog)
+	{
+		t1 = clock();
+		fprintf(fp_timelog, "%s", logEvent);
+		indent(n);
+		fprintf(fp_timelog, ": %f s\n", ((float)(t1 - starttime) / CLOCKS_PER_SEC));
+	}
+}
+
+
+void TimingLogWrite(const CHAR8* text)
+{
+	if (fp_timelog)
+	{
+		fprintf(fp_timelog, text);
+	}
+}
+
+
+void TimingLogStop()
+{
+	if (fp_timelog)
+	{
+		fprintf(fp_timelog, "\n");
+		fclose(fp_timelog);
+		fp_timelog = nullptr;
+	}
+}