Scheduling modes demo

This is a more advanced example demonstrating various scheduling modes supported by Gantt component:

• Normal - the default (and backward compatible) mode. It means the task will be scheduled based on information about its start/end dates, task own calendar (project calendar if there's no one) and calendars of the assigned resources
• Fixed duration - scheduling mode with fixed duration (the effort of task will change when assigning/removing resources)
• Effort driven - scheduling mode with fixed effort (the duration of task will change when assigning/removing resources)
• Dynamic assignment - scheduling mode with fixed duration and effort (the resources allocation will change when assigning/removing resources)