Fixed emoticons detection inside of a bbcode element

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Related tickets | #75, #79, #81
| License       | MIT

This is a draft code to respond to issue #75.

Pull requests #79 and #81 try to modify emoticon detection but is probably a wrong approach. The problematic is probably the context in which the text is located.

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