Should be possible to instantiate profiler for audio performance

Remove reliance on `Dplug_ProfileUI` for dplug.gui.profiler so that it can be instantiated and used in regular audio task. This is quite helpful.

Start by locating dplug.gui.profiler and its reliance on Dplug_ProfileUI, then trace how the profiler is instantiated and used during regular audio tasks. Done means the profiler can be instantiated and used there without relying on Dplug_ProfileUI; the issue mentions no specific files or tests to run.

Written by the indexing model from the issue text.