Caefer's Skilling Overhaul

Changelog
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- Added the remaining skill unlocks for Friendship out to level 100 (58 mob variants can now be befriended via the Friendship Skill)
- Added safety systems for recovering companions on crash and a method for re-summoning if they are lost somewhere without dying.
- Fixed companion following and behavior for mobs with non-standard movement.
- Fixed a crash that could occur when loading in with partially formed companion data.
- Added equipment support for humanoid mobs.
- Added new benefits for the Building skill, increased stack sizes in player inventories and a Builder Inventory for blocks accessible via Shift+E.
- Redesigned Skill Guide layouts and moved information into descriptions.