fea091e18e
This is part of #121565. Renames the `insert_blank_frame` function to `insert_frame`. Instead of returning a boolean for if the keyframe was created, return a pointer to the drawing. This aligns more with how we're using this API. After inserting a keyframe, it's common to then e.g. write to the newly created drawing. Also use sensible default parameter values for the duration (default = implicit hold) and the keyframe type (dafault = `BEZT_KEYTYPE_KEYFRAME`). With this change, we're moving closer to the goal of only allowing to create drawings by creating keyframes.
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