Inline helper.is_enabled, remove unused code, documentation fixes, remove formats and druid_input files, add more tests

test/test.gui_script

@@ -5,6 +5,9 @@ local tests = {
 	require("test.tests.test_button"),
 	require("test.tests.test_hover"),
 	require("test.tests.test_drag"),
+	require("test.tests.test_back_handler"),
+	require("test.tests.test_blocker"),
+	--require("test.tests.test_static_grid"),
 }