Implement Task Scheduler / Event Scheduler API

Adding implementation for Scheduled and Event Triggered tasks.

Includes all from #158 and some more, especially about Event Triggered tasks.

Implemented them in two different classes to avoid usage confusion, as they use different identifications and arguments for the same actions.

I also added password_confirm() to SysInfo as it was needed for creating/modifying tasks with root privileges.

Methods implemented:

Functions	Description
`get_output_config()`	Retrieve the task output configuration.
`get_task_list()`	Retrieve list of Scheduled and Event tasks.
`get_task_config()`	Get Scheduled task settings.
`get_task_results()`	Get results of a Scheduled task.
`set_output_config()`	Set the task output configuration.
`task_set_enable()`	Enable or disable a Scheduled task.
`task_run()`	Run a Scheduled task.
`task_delete()`	Delete a Scheduled task.
`create_script_task()`	Create a "User defined script scheduled task".
`modify_script_task()`	Modify a "User defined script scheduled task".
`create_beep_control_task()`	Create a "Beep control scheduled task".
`modify_beep_control_task()`	Modify a "Beep control scheduled task".
`create_service_control_task()`	Create a "Service scheduled task".
`modify_service_control_task()`	Modify a "Service scheduled task".
`create_recycle_bin_task()`	Create a "Recycle Bin scheduled task".
`modify_recycle_bin_task()`	Modify a "Recycle Bin scheduled task".

Functions	Description
`get_task_results()`	Get results of a Event Triggered task.
`get_result_output()`	Get the output for a given result.
`task_set_enable()`	Enable or disable a Event Triggered task.
`task_run()`	Run a Event Triggered task.
`task_delete()`	Delete a Event Triggered task.
`task_create_or_set()`	Create or modify a Event Triggered task.

N4S4 / synology-api