clang-format: update c/cc coding style

Update all cc code using .clang-format; please do so as well for future PRs
etc.; emacs has a handy 'clang-format' mode to make this automatic.

For comparing old changes with git blame, we can disregard this one using
--ignore-rev

(see https://www.moxio.com/blog/43/ignoring-bulk-change-commits-with-git-blame )

lib/utils/test-option.cc

@@ -23,37 +23,37 @@
 using namespace Mu;
 
 static Option<int>
-get_opt_int (bool b)
+get_opt_int(bool b)
 {
-        if (b)
-                return Some(123);
-        else
-                return Nothing;
+	if (b)
+		return Some(123);
+	else
+		return Nothing;
 }
 
 static void
 test_option()
 {
-        {
-                const auto oi{get_opt_int(true)};
-                g_assert_true(!!oi);
-                g_assert_cmpint(oi.value(),==,123);
-        }
+	{
+		const auto oi{get_opt_int(true)};
+		g_assert_true(!!oi);
+		g_assert_cmpint(oi.value(), ==, 123);
+	}
 
-        {
-                const auto oi{get_opt_int(false)};
-                g_assert_false(!!oi);
-                g_assert_false(oi.has_value());
-                g_assert_cmpint(oi.value_or(456),==,456);
-        }
+	{
+		const auto oi{get_opt_int(false)};
+		g_assert_false(!!oi);
+		g_assert_false(oi.has_value());
+		g_assert_cmpint(oi.value_or(456), ==, 456);
+	}
 }
 
 int
-main (int argc, char *argv[])
+main(int argc, char* argv[])
 {
-	g_test_init (&argc, &argv, NULL);
+	g_test_init(&argc, &argv, NULL);
 
-	g_test_add_func ("/option/option",  test_option);
+	g_test_add_func("/option/option", test_option);
 
-	return g_test_run ();
+	return g_test_run();
 }