Prepare release 0.3

Tobias Meiselrequested to merge
TobiasMeisel/ogstools:update_toml into main

Purpose

Preparation for release 0.3

@FZill @bilke @felikskiszkurno Please only review the release notes (last commit).

@heinzej Could you please have a look to all changes of this MR?

Edited by Tobias Meisel

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