e78fbad5fa
The end of a fixed duration frame is stored as a special `GreasePencilFrame`, notably with a `drawing_index` of -1. These were previously called "null" frames (because they don't point to a drawing). But this name wasn't great. This commit renames these to the more descriptive "end" frame. In code, they are `GreasePencilFrame::end()` and can be checked for with `frame.is_end()`. All comments and function names referring to "null" frames have also been updated. Pull Request: https://projects.blender.org/blender/blender/pulls/121868
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