Custom Tooltip API

This update focuses on improving performance, and adding a new option to align tooltip icons! (Thanks Afterlyte for requesting this!)

Additions:

• Implemented logic to align tooltip icons from resource packs to the start of the line so they can stay aligned
• Added a small tooltip to indicate the player to press shift when a tooltip is available

Upgrades:

• Completely rewrote most of the internal logic to improve performance
• Implemented heavy caching to improve performance further

Fixes:

• Fixed bug that made custom tooltips show up above the hotbar with position modes APPEND and PREPEND and line offsets != 0