User tag definition should be replaced with documentLink

[angelozerr]

Given this Qute renarde template:

{#form uri.Login.login() }

{\form}

To open, the user tags src/main/resources/templates/tags/form.html, we need to use definition (Ctrl+Click) on form which opens the form.html file (without range).

Opening a file, should b emanaged with documentLink, so we should move the definition feature to documentLink feature. It will give those advantages:

• documentLink exist sto open a file, so we should use it
• form will be underlined as render
• when you will have {#abcd and user will click on it it will create the abcd.html file