Custom Machinery 1.21.1-0.10.52

Additions :

• Allow custom tooltips to render in jei. (Thanks to Jishuna for this PR).
• Improve status gui element tooltip for multi-cores machines.

BugFix :

• Fix upgrade not being refreshed when switching items in slot.
• Fix recipe modifier being mandatory instead of optional in KubeJS upgrade builder.
• Fix bug where the machine appears as errored when all cores are idle.