Profiling techniques for GUI code

[jpo]

This is something I have used when trying to improve the perf of my gui:

Displaying statistics about the components that take the most time to paint

Here is a small patch to juce that displays the list of components that are being repainted, with their name, class name, duration of the last paint(). Here is an example of it output: TopLevelComponent: MyApp t=0.0282652 getClipBounds=0 0 1023 1123 0 0.028265s 100.0% 4.002453s (self: 1.0% 0.041799s) "MyApp" class StandaloneGUI sz=1023x1123 1 0.000142s 3.9% 0.155630s (self: 3.9% 0.155630s) "" class juce::MenuBarComponent sz=1021x31 1 0.028028s 95.1% 3.805024s (self: 0.1% 0.00547…