Small changes

• Changed recipe of the Endlex Energy Core (again) to be more balanced
• Changed recipe of the Polished Endlex Crystals to use less sand & paper

NEW FEATURE!

• Endlex Accumulator
  • Generates energy over time exponentially (aka More energy stored = More energy generated)
  • Make sure to either use the energy or disable generation using Redstone, else if it reaches max it gains a chance to explode!