Using XDG's user dir settings to determine where pictures are
stored for a user (e.g., "~/Pictures" -- used as a fallback).
May be overridden using "--exportdir".
Also, while I was updating some docs, replace references to
"Mac OS X" with "macOS", the new name of that OS these days.
Beginning addition of an option to export animated GIFs
from the Open -> Slideshow dialog, after choosing the images.
Non-operable at this time, but a button has been added (and will
provide a hint to select 2 or more images, when clicked).
Working around "...convert-im6.q16: too many bezier coordinates" by
updating SVGs of Starter images that were error'ing when creating
a thumbnail. Mostly, just loaded into Inkscape 1.0 & saving back out.
For a few, tightened up some places where Fill tool would spill over.
TOYAMA Shin-ichi noticed that when building for Win32 under mingw/msys,
an #include of "librsvg-cairo.h" was also necessary.
He also bumped the version # in win32/resources.rc
(and I put his credit in there).
I updated docs/RELEASE.txt to mention that .rc file also needing
updated when preparing a new release.
Wrapped some debug output in "#ifdef DEBUG" tests,
and made sure some warnings and errors were going to
STDERR, rather than STDOUT.
Motivation: Less noise while launching/using Tux Paint,
unless it matters.
Replaced KDE (older, KDE4, in fact) specific icon and
launcher (.desktop file) installation & uninstallaton
invocations in Makefile with those that use Freedesktop.org
`xdg-...` tools.
Manpage still showed that "--fullscreen" (with no value) could be
specified. Lately, it requires =yes, =no, or =native.
For https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769368
Also, remove a duplicated credit from the contributor list.
Ability to disable stereo panning effect (e.g., paint brush, UI
elements sound effect feedback, etc.), useful for users with
hearing impairment in one ear, or situations where one speaker or
headphone is being used. Use "--nostereo" command-line option
or "nostereo=yes" config. file option.
The thumbnails for starters & templates are NOT being re-generated
when the source images are modified -- only when the thumbnail is
missing. Needs an update to the target's prerequisites
(but I'm very rusty with this level of Makefile magic).
Also, update some Starter source images so they work better with
flood fill (Bald Eagle, World map, Gecko).
"Fill", as a new main-toolbar tool, was not recording snapshots
of the image for the "Undo" tool. Mended.
However, also updated the tool so that it doesn't _bother_ recording
into the undo buffer if the fill action is a no-op (e.g., clicking
the same spot a second time, or otherwise attempting to fill an
area with a color that's identical to what's already on the canvas).
Also generating and installing thumbnails of Template images,
thus getting "New" dialog to open extremely quickly.
(Pretty much "instantaneously" on my 8 year old laptop with
Intel i3 @ ~2GHz and Intel 320-series SSD (214 MB/s).)
