ConfigUtility now supports recursion; is a Singleton

If you have "config.next" set, the config system will load that as another
config file. Higher config files have a higher precedence over subfiles
when conflicting keys are encountered.

* Added singleton.hpp, containing Singleton<T>
* ConfigUtility now inherits from Singleton
* Tweaked timer.*pp layouts

common/debugging/timer.cpp

@@ -21,9 +21,25 @@
 */
 #include "timer.hpp"
 
+Timer::Timer(): start(Timer::Clock::now()) {
+	//
+}
+
+Timer::Timer(std::string s): name(s), start(Timer::Clock::now()) {
+	//
+}
+
+void Timer::Start() {
+	start = Clock::now();
+}
+
+void Timer::Stop() {
+	timeSpan = Clock::now() - start;
+}
+
 std::ostream& operator<<(std::ostream& os, Timer& t) {
 	os << t.GetName() << ": ";
-	os << std::chrono::duration_cast<std::chrono::nanoseconds>(t.GetTime()).count();
-	os << "ns";
+	os << std::chrono::duration_cast<std::chrono::milliseconds>(t.GetTime()).count();
+	os << "ms";
 	return os;
 }