Start-up performance test: switch to DEBUGMODE = 1

...instead of the old g_DisplayTimingReports method.

Also, performance reports have been moved to the Data/Debug folder.
Myriad program startup improvements

pdProfiler is earning its keep!  Profiling program startup over the past
few weeks led to the discovery of performance hits in a number of
unexpected places.  In particular, a few interface initialization
functions were thrashing the preferences file by updating the user
preferences file immediately after reading settings from the preferences
file; unbeknownst to me, this was adding some ~300-500ms to program load
time.

As we only need to update the preferences file when the user has
initiated a change, it was simple to add some overrides to the various
functions, and startup performance is now much better as a result.
Awesome.

Also, some minor translation engine optimizations in this commit.  It is
now the biggest performance hit at startup, but optimizing it further
will be tough.  I've got some ideas for 6.6 alongside Unicode work,
however.