Time tracking: dump of ideas

Time tracking is a new feature in 8.14 and we will improve it over time.

This issue lists all the things we could do with it. This is not an order of priority and if an item is present in the list, it does not mean we'll implement it.

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• Provide buttons to interact with time tracking feature ( #1206 (closed))
• Add a toolbar to switch between all tasks being currently time tracked ( #1205 (moved))
• Billable hours
• Reports (like this one) at a user level, project level, group level and instance level
• API