Proposal: Allow simple javascript anchors

This change would allow Anchors to be simple javascript links, often useful when using an anchor simply to trigger a javascript event.

Currently attempting to create an anchor such as:
`<a href="javascript:;">I can't exist</a>`
Results in Garden prepending the forum path to the link, e.g. 
`<a href="/vanilla-forums/javascript:;">I can't exist</a>`

This may just be a personal preference of mine, but it seemed like useful functionality to have without any sacrifice in particular. Figured it was at least worth the suggestion.
Ahhh fair enough, well I have not looked into parse_url enough yet to know what's best, however I must say a regex feels slightly more robust than a substr, but that may just be my new-found love of regexs speaking. I definitely feel like there needs to be a more versatile method of ensuring that the $Destination provided does indeed require being turned into a Garden URL, as I doubt this is the only instance of such a problem.