Creates a menu to do additional inputting

[zonble]

The PR lets the users to be able to show a menu by pressing Ctrl + . The menu contains following features

• Lowered cases Chinese numbers: 12349876 will become 一千二百三十四萬九千八百七十六
• Uppercases Chinese numbers, such as 壹仟貳佰參拾肆萬玖仟捌佰柒拾陸
• Suzhou numbers (蘇州碼 or 花碼). For example, 33.45 will become

〣三〤〥
十[單位]

• Other existing features like Big5 code and date macros.

[zonble]

Video demo

https://github.com/openvanilla/McBopomofo/assets/53011/997ce7eb-01c4-4a8a-96e3-699cdbc720ab