Import newclock3 patch, see newclock3 branch of popcornmix/xbmc.

Also add a Bash script to refresh it.
Add patch to disable total duration in Confluence.
Add patch to inconditionally force use of host compiler for JsonSchemaBuilder.

It otherwise requires manual intervention.
Add 03-git-revision-origin-head.diff.

Use origin/HEAD to determine Git revision, so that newclock3 commits are
excluded.