message: Have FontManager return const Font pointers
diff: @@ -44,7 +44,7 @@ public:
  * \warning The pointer returned by font() is owned by FontManager. Do not dispose of the
  * pointer manually.
  */
  - NAS2D::Font* font(const std::string& name, std::size_t size)
  + const NAS2D::Font* font(const std::string& name, std::size_t size)
  {
  auto it = mFontTable.find(FontId(name, size));
  if (it != mFontTable.end())
  