Add Custom TNT Blocker.

wowe much block.
such complicate.
**Justification for this PR:**
@EncryptedCurse said that this was a small step for me but a giant leap for SPAGT. (Not really, but it sounds good)
**Doge picture**:
![WOW such Spagt](http://cdn.memegenerator.net/instances/500x/43095327.jpg)