Issue description:

Hardness and Resistance aren't defined in BlockPlasticFence.java.
In consequence, plastic barriers can be instantly broken by a single empty-handed punch, and are flimsier in the face of explosions than plastic blocks or wooden fences.

Steps to reproduce:

1. Place plastic barrier. Punch plastic barrier. Plastic barrier breaks and drops.
2. Place plastic barrier again, and try to blow it up from various distances with TNT. It is flimsier than plastic blocks or wooden fences.

Version (make sure you are on the latest version before reporting):

Forge: 14.23.5.2838
Mekanism: 9.8.1.383

If a (crash)log is relevant for this issue, link it here: (It's almost always relevant)

No log necessary. Issue is 2 lines missing from the constructor in BlockPlasticFence.java.