Rowing Strokecoach & Multicoac

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New design of the buttons
In the tutorials, the images have now the right size on all devices (BUG)

Multicoach:
* When stopping and starting from multiple boats the same time is used now (BUG)
* Templates can now be created and loaded

Datenbank:
* Results can now be shared
* The entire database can now be exported and imported
* In the database overview, several elements can be selected (long press) and then deleted or shared
* In a race, a podium is now displayed