UC5 Planner and Schedule errors

[nobodyczcz]

UC5 Errors:

List and visualise both task scheduler errors and path planner errors.
Show all the errors, timestep first details after timestep
Planner errors: on default, at every timestep show all the affected agents coloured in red
Scheduler errors: by default show all the affected agents in red and put x on affected locations
Select an error from the list, shows only the affected agents (for planner error) or agents plus tasks for scheduler error.

[nobodyczcz]

Comments from #25:

We are still missing support for showing scheduler errors in the "errors list". We need to add this feature. Propose the following:

1. Generate example json with errors from each of the scheduler error categories, as discussed in the startkit documentation
2. Each error needs to appear in the errors list display element
3. We need to display/highlight agents mentioned in the error
4. The colour of mentioned agents should be yellow (warning, not critical)
5. The agents are highlighted just for the timestep of the error event