Pinyin and IPA Annotator wot Duld

The ways to use:
1. Select text and right-click on the context menu to show or remove pinyin and IPA annotation.
2. Right-click the page and open the context menu to show or remove pinyin and IPA of all words.
3. Click on the buttons to show/remove annotation or change IPA type (US or UK) in the popup interface.
4. Change IPA type in the options interface.

Note:
For Chinese polyphonic characters, all their pinyin are displayed. The first choice (not ensuring accuracy) is yellow, and the rest is gray.
For English words, multiple phonetic symbols may be displayed.