LibHTTP+WebServer: Add querystring support

[0xbigshaq]

When trying to access an HTML page with javascript in it(for example, a script that tries to access window.location.search), say test.html?foo=bar: the WebServer tries to open a file called test.html?foo=bar instead of just test.html. This leads to a false-positive 404 error, which prevents loading the HTML page.

Before the PR/patch:

After the patch: