Move most karaoke parsing/serializing/editing code to AssKaraoke rather
than being scattered all over the place, and add much better support for
non-karaoke override tags and comments.
Add a karaoke timing controller.
Redesign the karaoke syllable split/join interface to have a single mode
from which both splitting and joining can be done rather than separate
split and join modes.
Only show the karaoke split/join bar when karaoke mode is enabled.
Closes#886, #987, #1190.
Originally committed to SVN as r5613.
The old toolbar code didn't actually support any nontrivial
customization of toolbars, as it had a hardcoded list of commands which
would be enabled or disabled, and the checks for enabling/disabling
toolbar buttons was done only in the specific situations which those
commands used.
Make icon size a user customizable option and add support for
dynamically changing it at runtime.
Originally committed to SVN as r5468.
Thomas Goyne