Feature request: allow to override instance implementations

[leoloso]

Hi,

I use your plugin for a framework I've built, however I needed a couple of minor changes to make it work. Please check if you agree with these changes, then I can do the pull request and implement them myself.

*1. I need to change some functionality in classes AAL_API and AAL_Notifications, for which I've inherited from these classes. So, I need to be able to set the my own instances of these classes instead of the default ones.

In function AAL_Main::__construct(), I'd like to change:

$this->ui = new AAL_Admin_Ui();
$this->hooks = new AAL_Hooks();
$this->settings = new AAL_Settings();
$this->api = new AAL_API();
$this->notifications = new AAL_Notifications();
$this->help = new AAL_Help();

With add_action ('plugins_loaded', array($this, 'init_instances'), 1000);, and then:

function init_instances() {

	$ui_class = apply_filters('AAL_Main:ui:classname', 'AAL_Admin_Ui');
	$hooks_class = apply_filters('AAL_Main:hooks:classname', 'AAL_Hooks');
	$settings_class = apply_filters('AAL_Main:settings:classname', 'AAL_Settings');
	$api_class = apply_filters('AAL_Main:api:classname', 'AAL_API');
	$notifications_class = apply_filters('AAL_Main:notifications:classname', 'AAL_Notifications');
	$help_class = apply_filters('AAL_Main:help:classname', 'AAL_Help');

	$this->ui = new $ui_class();
	$this->hooks = new $hooks_class();
	$this->settings = new $settings_class();
	$this->api = new $api_class();
	$this->notifications = new $notifications_class();
	$this->help = new $help_class();
}

*2. I'd like to keep the notifications table, even if uninstalling the plug-in. Could there be an option, or even a hook, for this? I refer to this line, on file classes/class-aal-maintenance.php:

register_uninstall_hook( ACTIVITY_LOG_BASE, array( 'AAL_Maintenance', 'uninstall' ) );

Thanks