overload template_t::render to accept context as an r-value

[aloussase]

This allows us to do:

return crow::mustache::load("index.mustache").render({ { "key", "value" } });

Rather than:

crow::mustache::context ctx{ {"key", "value"} };
return crow::mustache::load("index.mustache").render(ctx);

[The-EDev]

CMake Error in CMakeLists.txt:

  Target "Crow" INTERFACE_INCLUDE_DIRECTORIES property contains path:


    "/drone/src/ASIO_INCLUDE_DIR-NOTFOUND"


  which is prefixed in the source directory.

@luca-schlecker any idea how to deal with this?

Edit: nevermind, seems like merging master fixed the issue

[The-EDev]

My apologies for the delay, merging now