various: greatly simplified job times

Hopefully this doesn't break everything

app/common/jobtime.cpp

@@ -0,0 +1,30 @@
+#include "jobtime.h"
+
+#include <QMutex>
+
+namespace olive {
+
+uint64_t job_time_index = 0;
+QMutex job_time_mutex;
+
+JobTime::JobTime()
+{
+  Acquire();
+}
+
+void JobTime::Acquire()
+{
+  job_time_mutex.lock();
+
+  value_ = job_time_index;
+  job_time_index++;
+
+  job_time_mutex.unlock();
+}
+
+}
+
+QDebug operator<<(QDebug debug, const olive::JobTime& r)
+{
+  return debug.space() << r.value();
+}