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

# FIXME: remove this when RSM and MAM are in wokkel
# XXX: the Monkey Patch is here and not in src/__init__ to avoir issues with pyjamas compilation
import wokkel
from sat.tmp.wokkel import pubsub as tmp_pubsub, rsm as tmp_rsm, mam as tmp_mam
wokkel.pubsub = tmp_pubsub
wokkel.rsm = tmp_rsm
wokkel.mam = tmp_mam