[SV 46995] Strip leading/trailing space from variable names

* makeint.h: Change MAP_SPACE to MAP_NEWLINE, and add MAP_PATHSEP
and MAP_SPACE which is now MAP_BLANK|MAP_NEWLINE.  Create
NEW_TOKEN(), END_OF_TOKEN(), ISBLANK(), ISSPACE() macros.
* main.c (initialize_stopchar_map): Set MAP_NEWLINE only for
newline characters.
* Convert all uses of isblank() and isspace() to macros.
* Examine all uses of isblank() (doesn't accept newlines) and
change them wherever possible to ISSPACE() (does accept newlines).
* function.c (func_foreach): Strip leading/trailing space.
* variable.c (parse_variable_definition): Clean up.
* tests/scripts/functions/foreach: Test settings and errors.
* tests/scripts/functions/call: Rewrite to new-style.
* tests/scripts/misc/bs-nl: Add many more tests for newlines.

tests/scripts/functions/sort

@@ -42,6 +42,10 @@ A boy captured_by days end, has jazz_and_a midnight moon_light rise
 
 run_make_test("FOO = a b\tc\rd\fe \f \f \f \f \ff
 all: ; \@echo \$(words \$(sort \$(FOO)))\n",
-              '', "5\n");
+              '', "6\n");
 
 1;
+
+### Local Variables:
+### eval: (setq whitespace-action (delq 'auto-cleanup whitespace-action))
+### End: