make noexpandtab explicit in all vim modelines other than xml files

Conflicts:
	src/include/switch_core_media.h
	src/mod/endpoints/mod_sofia/sofia_media.c
	src/switch_core_media.c

libs/openzap/src/priserver.c

@@ -324,5 +324,5 @@ int main(int argc, char *argv[])
  * c-basic-offset:4
  * End:
  * For VIM:
- * vim:set softtabstop=4 shiftwidth=4 tabstop=4:
+ * vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
  */