設定類別完成。

成員：
private static final Config INSTANCE = new Config();
protected static final String DEFAULT_LANG = "en-GB";
protected static final int CODE_DOT = 0;
protected static final int CODE_DASH = 1;
protected static final int CODE_SPACE = 2;
protected static final int CODE_SPACE_LETTER = 3;
protected static final int CODE_SPACE_WORD = 4;
protected static final int UNIT_DOT = 1;
protected static final int UNIT_DASH = 3;
protected static final int UNIT_SPACE = 1;
protected static final int UNIT_SPACE_LETTER = 3;
protected static final int UNIT_SPACE_WORD = 7;
protected int preset = 500;
protected int end = 500;
protected int unit = 200;
protected int repeat = 0;
protected boolean lock;
Merge branch '17-config-class' into develop
Merge branch 'develop' into 16-morsecode-class
加入執行緒和中斷功能.