Replaced EventListener with signals based on libsigc++

This replaces the rather hard to understand event dispatcher with a
probably even harder to understand templated library, but fortunately
we can rely on the available documentation.

Hopefully it will also help with the readability of our code and with
adding additional signals to other classes.

Added libsigc++ to README and Travis CI configuration.

Reviewed-by: Erik Schilling

1 files changed, 1 insertions, 2 deletions

diff --git a/src/scripting/script.cpp b/src/scripting/script.cpp
index 3e29946..63ab7ff 100644
--- a/src/scripting/script.cpp
+++ b/src/scripting/script.cpp
@@ -40,8 +40,7 @@ Script::Ref Script::mUpdateCallback;
 
 Script::Script():
     mCurrentThread(0),
-    mMap(0),
-    mEventListener(&scriptEventDispatch)
+    mMap(0)
 {}
 
 Script::~Script()