WikiWords as optional module (plugin)

[FND]

WikiWords? should be an optional feature that can easily be turned off.

Rationale

Regular users are often not familiar with WikiWords?, though even experienced users often perceive them as annoying.

Thus the use of WikiWords? is a personal preference and should not be forced upon anyone.

Implementation

Apart from the code dependencies, various shadow tiddlers need to be revised to not use WikiWords?.

[MartinBudden]

Actually, regardless if the optionality of WikiWords?, shadow tiddlers should be revised not to use WikiWords?, since a WikiWord? may not remaina WikiWord? when it is translated. This has already caused confusion for some translators.

[FND]

cross-reference: #679