[Feature Enhancement] Pen tool is not smooth

The pen tool is currently not very fluent and breaks at the tip when used with vigorous mouse movements.

**How it works now -**

- Collects the coordinates of points the cursor is going over
- Converts these points to an SVG path
- Displays the path on the screen and appends it as a child

The issue names no files or tests; start by tracing the pen tool from cursor-coordinate collection through SVG path conversion. Reproduce vigorous mouse movements and compare the rendered path, with no breaks at the tip, as the completion check.

Written by the indexing model from the issue text.