Throw error when trying to set a mob hostile to Creepers or Ghasts

[Chimaine]

Minecraft doesn't allow other entities to attack Creepers and Ghasts. Throw an error if a script tries to set a reaction to hostile towards one of these.

[Chimaine]

Throw error when trying to set reaction to hostile towards Creeper or Ghasts. Closes #52

→ <<cset d1f9eed12a96>>

[Chimaine]

Fix build script. The shadow jar wasn't reobfuscated properly. Add placeholder license, bump patch number, add version range dependency on Forge and add some missing @Side annotations (thanks to RWTema's SideChecker tool). Also check reaction when checking if a target is still valid. Throw error when trying to set reaction to hostile towards Creeper or Ghasts. Closes #52 Update to MobTalkerScript 2.3.1

→ <<cset c031cd0215c6>>