GameStateCutscene: yell on miss spelled section names
Clarify on source of warnings
Move tooltip data from Map_Event class to Event_Component class.
Add Map_Event::getComponent to get a specific event component
Map_Event: Remove power_src, power_dest and targetHero
Map_Event finding the tooltip: use new getComponent function
Use only one Event_Component for specifying the power path
Move damagemin/max from Map_Event to Event_Component
MapRenderer: complain about custom event types
Change stash triggering methods of events

We do not need to have a stash=true event component any more, but the
event type being "stash" is enough
parse_duration: do not use floating numbers but keep precision
Merge pull request #580 from stefanbeller/master

Refactor map events