display_queue -> display_callback

commit 67313dfb952f72fa40f2e733e9a132420a1762f1
Author: JensDiemer <git@jensdiemer.de>
Date:   Wed Sep 24 11:06:28 2014 +0200

    update unittests

commit 547c600dc18df3554425107145d4a632da8010e0
Author: JensDiemer <git@jensdiemer.de>
Date:   Wed Sep 24 10:47:55 2014 +0200

    update only direct run code

commit 7468ce8cf64255ff11083db5bc4e8dd3d13b4347
Author: JensDiemer <git@jensdiemer.de>
Date:   Wed Sep 24 10:47:11 2014 +0200

    update Multicomp6809 and CoCo, too.

commit 124caa96f875238432abe4ee2e5177f5c35f5c87
Author: JensDiemer <git@jensdiemer.de>
Date:   Wed Sep 24 10:46:37 2014 +0200

    split dragon 32 gui stuff

commit 2d4c2bd05e1976baff264aa73cffb0cfd1d102e0
Author: JensDiemer <git@jensdiemer.de>
Date:   Wed Sep 24 09:52:42 2014 +0200

    WIP: use direct call instead of display queue