Include strict lua file, throw error in configuration loading when overriding with unused variable

- Preventing True/true bug
 - Fix issue with unused variable in configuration_helper

src/engine/configuration.cpp

@@ -37,6 +37,7 @@ namespace {
     // We can't use ${SCRIPTS} here as that hasn't been defined by this point
     constexpr const char* InitialConfigHelper =
                                                "${BASE}/scripts/configuration_helper.lua";
+    constexpr const char* StrictLuaScript = "${BASE}/scripts/strict.lua";
 
     struct [[codegen::Dictionary(Configuration)]] Parameters {
         // The SGCT configuration file that determines the window and view frustum
@@ -649,6 +650,9 @@ Configuration loadConfigurationFromFile(const std::string& filename,
     if (FileSys.fileExists(absPath(InitialConfigHelper))) {
         ghoul::lua::runScriptFile(result.state, absPath(InitialConfigHelper));
     }
+    if (FileSys.fileExists(absPath(StrictLuaScript))) {
+        ghoul::lua::runScriptFile(result.state, absPath(StrictLuaScript));
+    }
 
     // Load the configuration file into the state
     ghoul::lua::runScriptFile(result.state, filename);