ShieldGrid

## 1.1.0

* TNT entities are now blocked by shields, bouncing off and draining energy on impact.
* Sub-level shield interaction is now always enabled, and the GUI toggle was removed.
* Shield grids can no longer be placed inside an active shield area, but can still be placed outside it.
* Offline-broken shields now drop as ownerless; whoever places them next becomes the new owner.
* Creative/gamemode players can break shields even if they are not the owner.
* Shield/Radar GUIs now only open with an empty hand, preventing conflicts while holding items or blocks.
* Projectiles fired from inside physical shields can now leave normally.
* Added a short cooldown to impact effects to prevent effect spam.
* Spyglass support added: looking at a shield now shows its properties and energy level.