Added chat functionallity making the bot able to send messages to the game chat for everyone to see. Used by calling self.send_chat(<message>).

Erik Ahlroth authored 5 years ago and David Bergström committed 5 years ago

*Removed ensuring there is a target in getTarget(), which solves a crash when debugging during runtime

Instead of having two ways of using abilities directly, have one
way which is consistent with the API. Now unit has one method called
`ability` which takes a AbilityID and optionally either a Position or
another Unit which to use the ability at.

Changed types. get_build_location_near accepts a non-negative integer: 0 indicates an exhaustive search

fixed indents to match previously written code

returns true if unit has target

Changed getTarget() in Unit.cpp to return Unit() if no target found