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/mu-option.hh

@@ -16,14 +16,18 @@
 
 #include "optional.hpp"
 
-
 namespace Mu {
 
 /// Either a value of type T, or None
-template <typename T> using Option=tl::optional<T>;
+template <typename T> using Option = tl::optional<T>;
 
-template <typename T> Option<T> Some(T&& t) { return std::move(t); }
+template <typename T>
+Option<T>
+Some(T&& t)
+{
+	return std::move(t);
+}
 constexpr auto Nothing = tl::nullopt; // 'None' is take already
 
-}
+} // namespace Mu
 #endif /*MU_OPTION__*/