Added PC_plugin_site_users_registration_widget widget.
Added PC_plugin_site_users_registration_register_widget widget.
Moved registration request handling code from the controller to the PC_plugin_site_users_registration_register_widget widget.
Moved all code from default template to the PC_plugin_site_users_registration_register_widget widget.
Modified default template to use PC_plugin_site_users_registration_register_widget widget.
Added multiple plugin specific site variables (editable in admin area):
	allowed_meta
	login_from_email
	register_success
	update_success
	btn_register
	btn_update
	label_login
	label_password
	label_retyped_password
	label_name
	label_email
	label_accept_terms
	label_accept_terms_link
	input_error_user_exists
	input_error_email_exists
	input_error_required
	input_error_name
	input_error_email
	input_error_password
	input_error_retyped_password