Add go to first/last and plus/minus art provider icons.

These icons will be used in the upcoming new implementation of the print
preview frame and as they are also natively supported by GTK+ it makes sense
to have support for them in wx itself.

Notice that the existing bookmark add/remove icons are already mapped to the
icons which look like plus and minus signs respectively in wxGTK but we need
plus/minus in print preview in the other ports too so add these icons under
explicit names.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66504 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

art/last.xpm

@@ -0,0 +1,22 @@
+/* XPM */
+static const char *const last_xpm[] = {
+"16 16 3 1",
+" 	c None",
+".	c Black",
+"X	c Gray100",
+"                ",
+"                ",
+"        .    ...",
+"        ..   ...",
+"        .X.  ...",
+" ........XX. ...",
+" .XXXXXXXXXX....",
+" .XXXXXXXXXXX...",
+" .XXXXXXXXXXX...",
+" .XXXXXXXXXX....",
+" ........XX. ...",
+"        .X.  ...",
+"        ..   ...",
+"        .    ...",
+"                ",
+"                "};