symbol keyboard & themes from google pinyin ime / 使用来自谷歌拼音输入法的符号键盘与主题

[rhjdvsgsgks]

google pinyin ime have a wider symbol keyboard. which provided much more symbol than usual gboard. it would be great if possible to used this symbol keyboard replace gboard one.
谷歌拼音有个挺大的符号键盘，提供了比 gboard 多很多的的符号，希望能用这个换掉目前的符号键盘

谷歌拼音还有个几个 gboard 没有的配色，希望能一并加进来

[rocka]

We also want a more user friendly symbol/emoji picker, but that's easier said than done.

As for custom themes, you can try our theme designer: https://fcitx5-android.github.io/theme-designer/

[berberman]

Closed by #123