update from dtk-template - clangd :) (#66)

* update from dtk-template and start work towards using clangd

* include <a> -> "a"

* Update build.yml

* remove/add non-trivial class in union warning

src/d/d_dvd.cpp

@@ -1,7 +1,9 @@
-#include <d/d_dvd.h>
-#include <m/m_dvd.h>
+#include "d/d_dvd.h"
+
+#include "m/m_dvd.h"
+
 // clang-format off
-#include <sized_string.h>
+#include "sized_string.h"
 // clang-format on
 namespace dDvd {