Add a pending frame list to GlobalFrameView
#163
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This adds a pending frame list to
GlobalFrameView. It's used if the lock for theFrameViewis not available at the moment. This may happen ifpuffin_eguiis rendering whilenew_frameis called on a different thread. In that case, this change prevents thepuffin_eguifrom blocking the other thread.puffin_eguialso currently deadlocks as it holds the lock for theFrameViewwhile also having profiling scopes, making a cycle with theGlobalProfiler. This change removes that deadlock.