Add a method to trigger by app name instead of pm_id

[Unitech]

km.actions.triggerAction('5a26ca0ff419704978defc63', {
    server_name: 'door-control',
    process_id: 0,                                                                                                                                                                                                  
    action_name: 'open door'
}).then(rep => {

Instead of process_id, allow to pass an app_name

[Eywek]

duplicate #39