Support multiple display mode for Japanese kan-on and go-on

[ayaka14732]

Currently the Yindian App supports the following modes:

    public static final int IPA = 0;
    public static final int HIRAGANA = 1;
    public static final int KATAKANA = 2;
    public static final int NIPPON = 3;     // This is the database representation
    public static final int HEPBURN = 4;

https://github.com/osfans/MCPDict/blob/09e2a6410ce1134cd5cbebbbb445c4d18aced3b0/app/src/main/java/com/osfans/mcpdict/Orth/Japanese.java#L13-L17