Clean up getTime helpers

This increases size of the getTime return values to 64 bits.
It also removes the TimeGetter classes since the getTime functions
are now very precise.

src/gettime.h

@@ -21,33 +21,18 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define GETTIME_HEADER
 
 #include "irrlichttypes.h"
+#include <time.h>
+#include <string>
 
-/*
-	Get a millisecond counter value.
-	Precision depends on implementation.
-	Overflows at any value above 10000000.
 
-	Implementation of this is done in:
-		Normal build: main.cpp
-		Server build: servermain.cpp
-*/
 enum TimePrecision
 {
-	PRECISION_SECONDS = 0,
+	PRECISION_SECONDS,
 	PRECISION_MILLI,
 	PRECISION_MICRO,
 	PRECISION_NANO
 };
 
-extern u32 getTimeMs();
-extern u32 getTime(TimePrecision prec);
-
-/*
-	Timestamp stuff
-*/
-
-#include <string>
-#include <time.h>
 
 inline std::string getTimestamp()
 {