Change keybindings code to use keybinding groups, each with a
separate enum set, which will make the plugin ABI more stable, and
lay the groundwork for plugin keybindings support.
Note: this breaks the plugin API.
Rename keybindings_cmd() to keybindings_send_command(), which now
takes a group_id argument.
Add keybindings_lookup_item().
Add documentation for keybindings structs.
Add support for plugin keybindings using the PLUGIN_KEY_GROUP()
macro.
Add a plugin keybinding for 'Insert Special HTML Characters'.
Rename KBCallback, cmd_id, cb_func with clearer names.
Add KeyBinding::menu_item field for setting accelerators (currently
does nothing).
Load keybindings keyfile after plugins have loaded at startup, so
their shortcuts are also loaded. Still to do: loading individual
plugin keybindings after startup.
Group most keybinding callbacks together according to keybinding
group.
Add keybindings_set_item() and add it to the plugin API.
Set main menu widget accels with keybindings_set_item() - they are
ignored for now. Popup menu accels are set separately.


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@2324 ea778897-0a13-0410-b9d1-a72fbfd435f5