Add common/match.c with match_glob() from theme.c

...and make it fully case-insensitive in preparation for window-rules.

src/common/meson.build

@@ -5,6 +5,7 @@ labwc_sources += files(
   'font.c',
   'grab-file.c',
   'graphic-helpers.c',
+  'match.c',
   'mem.c',
   'nodename.c',
   'parse-bool.c',