[Forge] CriticaLib

This is a library mod.

• Adds critical hit flag to Living Entity, so can share this flag another mods.
• When player or Living Entity occur crit hit, its crit hit flag change to true. If target is immune to its attacking, its flag changes false whether crit hit or not.

Mods that use this:

• [Forge] Critical Mod
• [Forge] Damage Indicator Mod