Improvement: Partial boon uptime

[samulisoderlund]

Many builds provide only partial boon uptime (or less than 25 stacks of Might). I think it would be useful to be able to track this as well. Currently a simple checkbox implies either 0% uptime or 100%. This feature could be implemented as an opt-in "advanced mode". What do you think?

[DeltaGW2]

I already had this on my list, forgot to open it as an issue.
My current idea would be partial boons shown from red to orange to yellow to green (you get the idea) based on the amount of stacks and alternatively give the option to show a numerical value.