limit dv::value templated constructors & refactor

src/logic/scripting/scripting_functional.cpp

@@ -160,7 +160,7 @@ vec2supplier scripting::create_vec2_supplier(
     };
 }
 
-dv::to_string_func scripting::create_tostring(
+value_to_string_func scripting::create_tostring(
     const scriptenv& env, const std::string& src, const std::string& file
 ) {
     auto L = lua::get_main_thread();

src/logic/scripting/scripting_functional.hpp

@@ -9,6 +9,7 @@
 
 namespace scripting {
     using common_func = std::function<dv::value(const std::vector<dv::value>&)>;
+    using value_to_string_func = std::function<std::string(const dv::value&)>;
 
     runnable create_runnable(
         const scriptenv& env,
@@ -70,7 +71,7 @@ namespace scripting {
         const std::string& file = "<string>"
     );
 
-    dv::to_string_func create_tostring(
+    value_to_string_func create_tostring(
         const scriptenv& env,
         const std::string& src,
         const std::string& file = "<string>"