Closed, see note in body: Reimplement transformation, handle Meta Nodes interrupting vertex grouping

[webdevred]

Closed due to weird timeline caused by doing Git when being hungry. Development will continue in #2

This update improves the way jbeam_edit processes meta nodes (such as {"group":"..."}) that interrupt vertex groupings within .jbeam files. Previously, encountering these meta nodes resulted in an explicit error message indicating unsupported input, preventing further processing.

Key changes:

• Extract all vertices from sections interrupted by meta nodes.
• Sort vertices within their respective groups while preserving the original order relative to meta nodes.
• Move and reinsert vertices back into their original nodes, maintaining file structure integrity.
• Enhance logic to gracefully handle meta nodes interrupting vertex lists.

Example of the previous grouping logic being broken by meta nodes:

{"group": "group1"}
["fr0", -0.426, -2.084, 0.235]
["fr1", 0.487, -2.072, 0.235]
{"group": "group2"}
["fr2", -0.418, -2.034, 0.300]

With this update, jbeam_edit properly handles such cases by treating meta nodes as separators, allowing vertices to be grouped and sorted correctly within their respective groups.