Transcription fixes / features

* Enable proper transcription for Taiwanese Pinyin;
(wasn't checking for "Taiwan (Pinyin)" config value)

* add support for changing tones by appending a tone number after a syllable;
(added to regex)

* strip Anki's <color> tag which messes up transcription.
(example: nǐ hǎo, put the cursor after the space, hit backspace, then type "4")