make addAllCallback actually useful. Previously it added an object as a callback target even if it didn't implement the callback handler, this was pointless and stupid, now it checks.
make addAllCallback actually useful.
Previously it added an object as a callback target even if it didn't implement the callback handler, this was pointless and stupid, now it checks.

Change-Id: I24ce9f063a0f1f95e84ad2ae28a67e335cd63afe
Reviewed-on: http://gerrit.dmdirc.com/2519
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <79e2475f81a6317276bf7cbb3958b20d289b78df@dmdirc.com>

csmith/DMDirc-Parser,greboid/Parser,ShaneMcC/DMDirc-Parser,DMDirc/Parser