Change the LuaFunction subclass instance name suffix to _lua.

We add a suffix to let us publish a Lua foo() function that wraps a C++ foo()
function. Of course the lua_CFunction must accept lua_State* and extract its
parameters from the Lua stack, so it must invoke different C++ code than the
C++ foo() function it's trying to reach. So the lua_CFunction is a method of
the LuaFunction subclass instance named foo_lua.

The suffix was _luadecl, but since the class name shows up in log messages,
make it the more streamlined _lua instead.

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