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

libs/main/io_devices/pigpio.cpp

@@ -28,6 +28,7 @@
 #  include <fcntl.h>
 #  include <unistd.h>
 #endif
+#include "piliterals.h"
 
 
 //! \class PIGPIO pigpio.h
@@ -71,7 +72,7 @@ PIGPIO::PIGPIO(): PIThread() {}
 
 PIGPIO::~PIGPIO() {
 	stop();
-	waitForFinish(100);
+	waitForFinish(100_ms);
 	PIMutexLocker ml(mutex);
 #ifdef GPIO_SYS_CLASS
 	PIVector<int> ids = gpio_.keys();