more literals, use some in PIP, small refactor PIThread::start (clang-format mistakes)

libs/main/thread/pithread.h

@@ -163,8 +163,10 @@ public:
 
 	EVENT_HANDLER0(bool, waitForStart) { return waitForStart(-1); }
 	EVENT_HANDLER1(bool, waitForStart, int, timeout_msecs);
+	bool waitForStart(PISystemTime timeout);
 	EVENT_HANDLER0(bool, waitForFinish) { return waitForFinish(-1); }
 	EVENT_HANDLER1(bool, waitForFinish, int, timeout_msecs);
+	bool waitForFinish(PISystemTime timeout);
 
 	//! \~english Set necessity of lock every \a run() with internal mutex
 	//! \~russian Устанавливает необходимость блокировки внутреннего мьютекса каждый \a run()