version number and revision information logged on startup

while the version number appears in the window title it was not visible
in the log. moreover, the SDL version number appears early in the log
and may have led people to believe it was the version number of the
emulator

gopher2600.go

@@ -212,7 +212,9 @@ func main() {
 // launch is called from main() as a goroutine. uses mainSync instance to
 // indicate gui creation and to quit.
 func launch(sync *mainSync, args []string) {
-	logger.Logf(logger.Allow, "runtime", "number of cores being used: %d", runtime.NumCPU())
+	logger.Logf(logger.Allow, "gopher2600", "%s", version.Version)
+	logger.Logf(logger.Allow, "gopher2600", "%s", version.Revision)
+	logger.Logf(logger.Allow, "gopher2600", "number of cores being used: %d", runtime.NumCPU())
 
 	// use flag set to provide the --help flag for top level command line.
 	// that's all we want it to do