app, tools: add "running" thread attribute to GimpBacktrace/performance-log
The "running" attribute (readable through gimp_backtrace_is_thread_running(), and recorded in the performance log) specifies if the thread was in a running or suspended state at the time the backtrace was taken. It is accurate on Linux, but only approximated on Windows. Adapt the performance-log-expand.py tool to maintain this attribute (and any future thread attributes we might add).
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