Sphere TD

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- Improve main tutorial for new players
- Added 2 new towers Scrap Sentry and Rusted Sentry, as part of new player tutorial
- Sentry I is now unlocked in map 1
- ModCards now unlock at map 5 instead of map 25
- You can now skip a ModCard offering. Skipping spends the pick.
- Build Tower upgrades no longer roll a downgrade. Upgrades now roll 1 to 6 tiers above the current tower.