icons: Changes symbolic

symbolic:

scalable.svg renamed to symbolic-scalable.svg
(similar to color-scalable.svg)

added and assigned all icons to swatch palette,
icon color of all icons within symbolic-scalable can now be
adjusted to any desired shade of any desired color by simply
adjusting color of swatch palette.
Color of intentiously different colors (like e,g, black or white)
are unaffected.

icons/Symbolic/Makefile.am

@@ -9,7 +9,7 @@ icons_DATA = \
 ## official icon themes have the same list.
 include $(top_srcdir)/icons/icon-list.mk
 
-scalable/%.svg: scalable.svg ../../tools/compute-svg-viewbox
+scalable/%.svg: symbolic-scalable.svg ../../tools/compute-svg-viewbox
 	mkdir -p scalable && \
 	SVG=`$(top_srcdir)/tools/extract-vector-icon.sh $< $*` && \
 	echo $${SVG} > $@