feat request: clickify `mudlet install` and `help mudlet`

[iLPdev]

https://wiki.mudlet.org/w/Manual:UI_Functions#setLink

[sorenmarkert]

It doesn't say explicitly here, but it should work in general for underlined text.

For example, type help fish or something, and see all the underlined commands that would then be clickable.

[iLPdev]

Global underlined, non-url links is definitely an mxp feature. This would only affect those two instances specially, unless there is some way of spoofing mxp from client side.