feat(wpmc S4): OptionsPage::do_register registers routing field group

Also: add acf_add_options_page to acf-stubs.php; add translation-function
stubs to acf-stubs.php; fix TestCase::tearDown to call Patchwork::restoreAll()
in a finally block so that when('function_exists') routes are always cleaned up
even when Mockery::close() throws InvalidCountException.

tests/TestCase.php

@@ -33,7 +33,15 @@ abstract class TestCase extends BaseTestCase
             $GLOBALS['wp_the_query'],
             $GLOBALS['post']
         );
-        Monkey\tearDown();
+        try {
+            Monkey\tearDown();
+        } finally {
+            // Patchwork routes MUST be disconnected even when Monkey\tearDown() throws
+            // (e.g. Mockery count validation failure).  If they are not, any
+            // when('function_exists')->alias() from the failed test stays active and
+            // causes "Cannot redeclare function __()..." in the next test's setUp().
+            \Patchwork\restoreAll();
+        }
         parent::tearDown();
     }
 }