Add rudimentary unit testing via AIN file

Building 'test/test.pje' with the SDK compiler produces a file at
'test/Run/test.ain' which can be run with xsystem4 to test various
features.

Not the greatest testing method, but it works.

test/Source/System/System42/README.md

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+Note
+----
+
+I am not 100% sure about the legality of distributing System40.exe and
+Sys42VM.dll here, so I've left them out. They can be found in the System 4 SDK,
+which you'll want to have anyways to compile these tests.
+
+Once you've copied the files, this directory should contain the following:
+
+    System40.exe
+    System40.ini
+    DLL\Sys42VM.dll

test/Source/System/System42/System40.ini

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+; ★ System4.0 初期設定ファイル ★
+; このファイルの中身は書き換えないで下さい
+
+; ｉｎｉファイルバージョン
+IniFileVersion	= 1
+
+; 初期ビューサイズ
+ViewWidth	= 800
+ViewHeight	= 600
+
+; ゲーム名
+GameName	= "test"
+
+; レジストリ名
+RegName		= "Software\nunuhara\test"
+
+; コード名
+CodeName	= "test.ain"
+
+; ＶＭ設定
+MainVM		= "Sys42VM"
+
+; セーブフォルダ設定
+SaveFolder	= "SaveData"
+
+; DLLフォルダ設定
+DLL		= "DLL"
+
+; スキップ名設定
+MsgSkipName = "既読スキップ"
+
+; 音楽設定
+UseCD = false
+
+; ジョイパッド設定
+UseJoypad = true
+
+; ボリュームバランサー設定
+VolumeValancer[0] = "ＢＧＭ"
+VolumeValancer[1] = "効果音"
+
+; end of file

test/Source/System/System42/System42.inc

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+
+CopyToRun = {
+	"System40.exe",
+	"System40.ini"
+}
+
+CopyToDLL = {
+	"DLL\Sys42VM.dll",
+}