... There was no reason to store the help location preferences as per-project
state. Also move the dialog for quick fixes near its only use in
HelpMenus.cpp.
This takes 22 files out of the big strongly connected component, notably
the much used lower level utilities, ErrorDialog and AudacityException.
HelpSystem itself is still in a small cycle with LinkingHtmlWindow.
... Unnecessary because transitively included.
But each .cpp file still includes its own .h file near the top to ensure
that it compiles indenendently, even if it is reincluded transitively later.
Following a lengthen discussion on the quality list, consensus is this option
should always have been off by default. The main argument for not changing
it now was that 'on' is what users have come to expect.
... except Experimental.h, but see preceding commit.
This is especially important in the header files.
Be sure there are no quiet changes of meaning when a header file is included
in a different context, not having seen Audacity.h. Rather include Audacity.h
even if redundantly.
Also, in some header files, move more inside the include-guard #ifdef-#endif
pair.
... so that USE_* macros will be seen first, and so
EXPERIMENTAL_AUTOMATED_INPUT_LEVEL_ADJUSTMENT, for one, is correctly defined.
I hesitated actually to include Audacity.h in Experimental.h. Maybe no
need for that hesitancy. But instead I use #error if Audacity.h has not been
seen yet.
... except Audacity.h; and in no others.
Do so even if Experimental.h gets multiply included, as in both the .h and
.cpp files.
This makes it easier to do a text scan to be sure there are no unintended quiet
changes of meaning because of omission of Experimental.h when the flag is
an enabled one.
Also move inclusions of Experimental.h earlier.
Also don't require Experimental.h to be preceded by Audacity.h to define
EXPERIMENTAL_MIDI_OUT correctly.
... so that we can use Track::SharedPointer without undefined behavior even on
tracks that don't yet belong to any TrackList.
Also fix the return type of function template TrackList::Add and remove some
casts.
... for wxString and wxArrayStringEx, holding file paths (absolute or relative,
directory or plain file); to be replaced later with different types
(not yet using std::vector, becase of some uses of wxArrayString::Index with
two arguments)
