Registers a new accelerator with the global accelerator map.
This function should only be called once per accel_path with the canonical accel_key and accel_mods
for this path. To change the accelerator during runtime programatically, use
change_entry.
Set accel_key and accel_mods to 0 to request a removal of the accelerator.
Note that 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 g_intern_static_string.
| accel_path |
valid accelerator path |
| accel_key |
the accelerator key |
| accel_mods |
the accelerator modifiers |