Split the action "Incite City".

Split the action "Incite City".

Stop relying on the Spy unit type flag to decide if the "Incite City" action
consumes the actor unit. Split the new action "Incite City Escape" from
"Incite City". The former will have its actor try to escape. The latter will
always consume the actor unit.

This makes it possible to create a ruleset where all actor units, including
those with the Spy utype flag, are consumed when inciting a foreign city to
revolt and join the actor's side. It makes a ruleset where no actor units,
including those without the Spy utype flag, will try to escape after
inciting a revolt. It also makes more complex rules, like "inciting a revolt
consumes the unit unless the city belongs to a democracy, possible.

See hrm Feature #660927

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@35621 a0f10bec-cc02-0410-94fc-a9cfff90b4cd