Consolidated branding in configure

Removed individual options (intro* and startcenter* + images) in favor of a folder with graceful fallback.
Grouped progress bar intro settings in a text file into the branding folder

Change-Id: Ib56b80e43c474a944ac79c0a842d66487e9f91d5
Reviewed-on: https://gerrit.libreoffice.org/1704Reviewed-by: Petr Mladek <pmladek@suse.cz>
Tested-by: Petr Mladek <pmladek@suse.cz>

instsetoo_native/util/openoffice.lst.in

@@ -19,6 +19,8 @@ Globals
             PROGRESSSIZE 319,10
             PROGRESSPOSITION 164,225
             PROGRESSFRAMECOLOR 207,208,211
+            PROGRESSTEXTBASELINE 287
+            PROGRESSTEXTCOLOR 255,255,255
             NATIVEPROGRESS false
             REGISTRYLAYERNAME Layers
             SERVICEPACK 1