Installs an accelerator in this group, using an accelerator path to look up the appropriate key and modifiers (see add_entry).
When this is being activated in response to a call to
closure will be invoked if the
accel_mods from accel_groups_activate
match the key and modifiers for the path.
The signature used for the
closure is that of AccelGroupActivate
accel_path string will be stored in a Quark. Therefore, if you
pass a static string, you can save some memory by interning it first with
the accelerator group to install an accelerator in
path used for determining key and modifiers
closure to be executed upon accelerator activation