What’s for Beta

经过和Travis与Zhongqiu讨论，我们希望我们发布的Beta版本会支持如下内容：

1. Naïve long-term plan UI (Useable)
2. Naïve long-term plan back logic (Useable)
3. Dictionary page
   1. size auto change
   2. change expand interaction
   3. switch orange and gray meanings
   4. when back to this page, the current dictionary should be obtained
   5. two buttons' corner radius
   6. remove blank between dictionary name grid and expand grid
4. recite page
   1. size auto change
   2. circle shouldn't be moved down
   3. add content in circle when "按住继续" is shown
   4. click performance of pronounce button
5. speed slider
   1. corner radius
   2. remove gray area between small circle and left orange slider
   3. show "speed" content
   4. UI of slider disappear (or in setting page)
6. User course
7. Merge bing dictionary UWP v1.5 into our code
8. Settings Page
9. Test plan and implement
10. Night Mode