Spell parts

[IchHabeHunger54]

Adds some of the missing spell parts, alongside some minor fixes and improvements.

• Implemented the Beam shape as planned.
• Implemented a modified version of the Chain shape. It is now a modified version of Beam that jumps to up to four extra targets.
• Implemented the Falling Star component as planned.
• Implemented the Mana Blast component as planned.
• Reworked the hidden Mana Shield component to Health Boost.
• Water Breathing is now a Green part and slightly more expensive.
• Chain is now located in the Offense tree, between the Beam and Damage parts.
• Recipes of some spell parts have been changed.
• Added tags for spellcrafting starting and finishing items, replacing the hardcoded Blank Rune and Spell Parchment, respectively.
• Various small fixes and improvements.