Panel repaint safety

[ustk]

@Christoph-Hart

1. Can we have a safety that ignores repaint() if the previous call isn't done so we don't get a time-out issue?
   With timers, even when choosing a comfortable time value, the CPU can spike from another running program and cause a time-out. Often this does not lead to anything bad, but sometimes the animation freezes for good. (And I don't think having a time-out notice is good anyway...)

2. This leads me to wonder if the crash one can sometimes get with custom LAF isn't related to this sine the repaint is looped too.

[d.healey]

@ustk I haven't experienced these issues, do you have a snippet that demonstrates it?

[ustk]

@d-healey I can't share the one I'm actually on but I experience this in all advanced painting when firing up the CPU and this since I'm using Hise for years (like when building in XCode at the same time for instance)
I imagine it depends a lot on the CPU power though...
Note that I'm talking about quite heavy paintings, but nothing stupidly big either...