Added basic time-profiling to `destImage`

• Added basic `mach_absolute_time()`-derived time profiling to `- destImage`’s image regeneration.
	» Prints the result in milliseconds after redrawing.
	» Currently inaccurate since the CGDataProviderCreateDirect() doesn’t call genDestImageBytesAtPosition() until it needs to— when drawing, well after we’re done profiling.  Sad.