struct literal of URL very easy to misuse

[John-Colvin]

e.g. URL("http://www.google.com") compiles but very much does not do what it looks like.

[FigmentEngine]

missing final slash after host causes problems:
URL url;

`

if (tryParseURL("example.com/?" ~ "country=france", url)) {
	string country = url.queryParams["country"].front;
	writefln("Url %s QS %s", url, country);
}`

works, but this won't as it won't find the query string due to the lack of the forward slash
`

if (tryParseURL("example.com?" ~ "country=france", url)) {
	string country = url.queryParams["country"].front;
	writefln("Url %s QS %s", url, country);
}`