Misc: Avoid highlighting last-used menu item if quick save is disabled

Avoid highlighting last-used menu item if quick save is disabled.
Change: Remove escaping in Cmis.utility.format()

Remove escaping code in Cmis.utility.format() and rely on
Cmis.utility.validate() for escaping.
Change: Use more reversible escape on file names

Use URL-encoding escape on file names in Cmis.utility.validate(), and
avoid collapsing multiple characters. Less readable, but more
reversible.