[MSX] Butterly nets and robin eggs

[Karol1223]

Summary

Content of the change

New sprites:

• Butterfly net - item and wielded
• Collapsible butterfly net - item and wielded
• Collapsible butterfly net (extended) - item and wielded
• American robin egg
• Large rock - wielded

Edited sprites:

• Rock - item and wielded
• Flaking rock
• Large rock - item
• Sharp rock - item and wielded
• Egg - barely edited, actually; just minor denoising and moving it onto a smaller canvas

Also moved the items using the old outdated sharp rock wielded sprite into a single JSON file and made them use the new one instead

Testing

Additional information

[Fris0uman]

Commenting here too for book keeping: I don't think we need to redo the rocks to unify the pallettes.