Add option to support bold text without surrounding spaces

[Eliot00]

In Chinese, there is no need for spaces to separate words. In org-mode, this kind of bolding requires a plugin to support it.

Example:

汉字*突出*问题

In fact, this scenario may also occur in English: I have two ~vector~s

[rasendubi]

I believe that this is commonly solved by inserting zero-width spaces around emphasis marks: #98

Would that work for you?