Instead of less readable func_get_args and call_user_func_array

issue #5827

Useful for filling shadowExpire with templates, this works by giving
 'epoch' as format in the date modifier.
Result is the number of date since epoch, as is needed in shadowExpire
 field
(Standard format U is number of seconds since epoch, aka timestamp)

issue #5746

issue #5745

There are some left in datepicker.js because of a bug in the sniffer,
 I did not find a way to fix that yet.

issue #5690

Fixes #5358 Fixed ImageAttribute usage in templates. Added special %% string start for template values

Remove the useless trailing whitespaces at the end of this line
Add one whitespace between the colon and the value.

Signed-off-by: Mortier Benoit <benoit.mortier@opensides.be>