* add global `hasCJKLanguage` flag, if true, turn on auto-detecting CJKLanguage
* add `isCJKLanguage` frontmatter to force specify whether is CJKLanguage or not
* For .Summary: If isCJKLanguage is true, use the runes as basis for truncation, else keep as today.
* For WordCount: If isCJKLanguage is true, use the runes as basis for calculation, else keep as today.
* Unexport RuneCount
Fixes#1377