Update to the Watermelons generator and printing files

I have added some small features to the Generator. For 3D printing I have improved the connection for the keychain holes by a lot. You would need lots of force to rip them apart now. I also added more variation parts including parts with holes in the center. You will also find more exported text extra parts to choose from.

Change Notes Watermelons Generator
- Changed !-SHOW-PrintingBooleansInstead to be at the top (Just so its quicker to switch this)
- Added ExtraHoleBoolean feature (Used for Center holes or any other extra boolean)
- Added KeyHole-AddToWhite, optional that is used to make connections stronger on the white part so keyrings can't rip it apart (does not work with different angles/crops out of the box)
- Fixed KeyHole-EraseHoles-DistFactor, it did not work for crop/slice parts before
- Added more text parts (You can change these objects to any text)
- Changed several values on the 3D printing preset melons

Change Notes WatermelonsFor3Dprinting.zip:
- Improved connection for keychain holes strength by a lot,
use WHITE-___wKeyholeConnection parts to get that extra strength,
Red slice keyholes parts have been changed for this!
- Added CenterHole Red Parts

- Added more holes variations (for filament seeds)
- Added more extra text parts