changed: <ignoreatstart> to <ignoresecondsatstart> and bump to 180 seconds by...

changed: <ignoreatstart> to <ignoresecondsatstart> and bump to 180 seconds by default. Also <ignoreatend> is not <ignorepercentatend> which defaults to 8%.  Ticket #10207.

git-svn-id: https://xbmc.svn.sourceforge.net/svnroot/xbmc/trunk@34346 568bbfeb-2a22-0410-94d2-cc84cf5bfa90
(cherry picked from commit ac6e9898)