Documentation improves
* Update date and version numbers * Remove final whitespaces * Remove unused kappname entity * Use suitable tags, add empty lines and re-indent some sections (more readable) * Use a suitable capitalization, tagging and punctuation * Use more entities * Change http: to https: * Add GUI icons and renew a screenshot

| W: | H:
| W: | H:


doc/media-playback-start.png
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doc/step_object_Particle.png
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doc/step_object_Stick.png
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