added option to not trigger further animations if CE change event consumed

added option to not trigger further animations if CE change event consumed

This adds the parameter "consume_ce_event" to the ".style" option of
global animations to prevent any further global animation to be
triggered by "ce_change" events (".init_event" or ".anim_event") if
the event was already recognized by any other global animation (which
therefore "consumes" this event).

Using this option, several similar global animations can be defined
that are triggered one after another by several custom element changes
to make it possible to show several similar global animations for
multiple CE changes at the same time.