Add support for id ranges to XRC.

Allow to declare ranges of consecutive IDs in XRC by using the "id[n]" syntax.
Show this functionality in the xrc sample and test it in the new unit test.

Also show and test the "object reference" XRC functionality.

Closes #11431.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66059 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/xrc/rc/objrefdlg.xpm

@@ -0,0 +1,26 @@
+/* XPM */
+static const char *const objrefdlg_xpm[] = {
+"16 16 7 1",
+" 	c None",
+".	c #EBF70E",
+"+	c #000000",
+"@	c #808080",
+"#	c #0000FF",
+"$	c #FFFFFF",
+"%	c #F8A836",
+"   .            ",
+"+++.++++++++++++",
+"+.@.@.@@@@@@.@@+",
+"+@...#######.#@+",
+"...@....@@.@.@.+",
+"+@...$$$$$$...@+",
+"+.$.@.@@@%%%$%..",
+"+@$.@@@@@@@%%%@+",
+"+@$.$$$$$$%$%$%+",
+"+@$$$$$$$$$$%$@+",
+"+@$$$$@@@@$$$$@+",
+"+@$$$$@@@@$$$$@+",
+"+@$$$$$$$$$$$$@+",
+"+@@@@@@@@@@@@@@+",
+"++++++++++++++++",
+"                "};