tools (common/template): ScriptsHandler fix/improvments: ScriptsHandler was not used so far, this commit fix it to be usable: - script can be imported with "include" - generate_scripts is used to generate the <script> elements generation, in base page - paths use root_path, so they are adapted to context - generate_scripts return a Markup string, so it's not escaped

(binary:application/octet-stream)