Add new log categories: dbinfo, tpanelinfo, rename: tpanel to tpaneltrace.
Move DB init/deinit/write back low frequency events to dbinfo.
Add log events to tpanelinfo for tpanel ID set and CIDS recalculation.
Fix some broken TPANEL_COPIOUS_LOGGING log lines in tpanelparentwin_nt_impl::PushTweet.
Add utility function to dump summary string of a CIDS set.
Use set_union for two biggest source sets in tpanel::RecalculateTweetSet.
This is to reduce set calculation time by avoiding N log N insertion
and set re-writing for the second input set.
Add item to log window debug menu to flush log outputs.