Add a new "Swap compression" option to the preferences, allowing
explicit control over the tile-swap compression algorithm.
Previously, control over swap compression was only possible through
GEGL command-line options/environment variables. Since the GEGL
API to list all available compression algorithms is still private
for now, we currently only list the three predefined compression
levels -- "best performance" (the default), "balanced", and "best
compression" -- and a "none" option, to disable compression
altogether. Selecting a custom compression algorithm is possible
by entering its name manually.
Add "color-profile-path" to GimpDialogConfig to remember the last-used
path in any profile chooser dialog.
Whenever a GimpColorProfileChooserDialog is created, call a new
gimpwidgets-utils helper function that connects to the dialog's "show"
and "response" signals and makes sure "color-profile-path" is set on
the dialog if it doesn't have a current folder already, and sets the
property back to the config object when a profile was actually chosen
from disk.
