app, libgimpwidgets: Dark theme and Symbolic icons as defaults.

These seem the expected theming defaults nowaydays, for a graphics
software, and so GIMP will follow these recommendations.

app/config/gimpguiconfig.h

@@ -24,8 +24,8 @@
 #include "config/gimpdisplayconfig.h"
 
 
-#define GIMP_CONFIG_DEFAULT_THEME          "System"
-#define GIMP_CONFIG_DEFAULT_ICON_THEME     "Color"
+#define GIMP_CONFIG_DEFAULT_THEME          "03-Dark"
+#define GIMP_CONFIG_DEFAULT_ICON_THEME     "Symbolic"
 
 
 #define GIMP_TYPE_GUI_CONFIG            (gimp_gui_config_get_type ())

docs/gimprc.5.in

@@ -850,7 +850,7 @@ Sets the theme search path.  This is a colon-separated list of folders to
 search.
 
 .TP
-(theme "System")
+(theme "03-Dark")
 
 The name of the theme to use.  This is a string value.
 
@@ -861,7 +861,7 @@ Sets the icon theme search path.  This is a colon-separated list of folders to
 search.
 
 .TP
-(icon-theme "Default")
+(icon-theme "Symbolic")
 
 The name of the icon theme to use.  This is a string value.
 

etc/gimprc

@@ -667,7 +667,7 @@
 
 # The name of the theme to use.  This is a string value.
 # 
-# (theme "System")
+# (theme "03-Dark")
 
 # Sets the icon theme search path.  This is a colon-separated list of folders
 # to search.
@@ -676,7 +676,7 @@
 
 # The name of the icon theme to use.  This is a string value.
 # 
-# (icon-theme "Default")
+# (icon-theme "Symbolic")
 
 # When enabled, pressing F1 will open the help browser.  Possible values are
 # yes and no.

libgimpwidgets/gimpicons.c

@@ -50,7 +50,7 @@
 
 #define LIBGIMP_DOMAIN          GETTEXT_PACKAGE "-libgimp"
 #define GIMP_TOILET_PAPER       "gimp-toilet-paper"
-#define GIMP_DEFAULT_ICON_THEME "Color"
+#define GIMP_DEFAULT_ICON_THEME "Symbolic"
 
 
 static GtkIconFactory *gimp_stock_factory = NULL;