Initial CALLHLL and Math.dll implementation

HLL libraries are compiled into the executable rather than dynamically
loaded as in early versions of System 4. These days AliceSoft does the
same thing.

test/Source/System/System42/System40.ini

@@ -26,6 +26,11 @@ SaveFolder	= "SaveData"
 ; DLLフォルダ設定
 DLL		= "DLL"
 
+; DLLファイル設定
+LoadDLL = {
+	"SACT_DLL.inc",
+}
+
 ; スキップ名設定
 MsgSkipName = "既読スキップ"