Add a way to find or profile one off blocks

[jswigart]

Currently each thread gets its own block and line in the html page that moves forward in time as it runs and completes samples. Often times it's useful to profile occasional areas of code that are hit for a frame but then lost in the time line.

It would be super useful if one could create or label a one off sample scope so that it can be found easily in the html page. It could be diverted to its own line and block, or perhaps a search feature could be used to find things easier.

I tried to create a temporary sample scope by changing the thread name around the scope hoping it would end up in its own block in the output,but that didn't work.

[dwilliamson]

I want to add a "timeline overview" window below the timeline that allows you to scroll through all the frames.

I guess a simple way of achieving this would be to drop labels onto that so you can see them immediately and click to jump to them.