feat: rectangle and brush type lasso selection

[flekschas]

This PR adds two new lasso types for selecting points: rectangle and brush. It also adds support for removing selected points and mapping multiple action onto the same modifier key.

In addition, this PR updates the example pages by moving settings to a Tweakpane panel.

Description

What was changed in this pull request?

• Feat: add support for two new lasso types: 'rectangle' and 'brush'. The lasso type can be changed via lassoType. Additionally, for the brush lasso, you can adjust the brush size via lassoBrushSize. The default lasso type is 'freeform'. (#186)
• Feat: replace keyMap with actionKeyMap to allow triggering multiple actions with the same modifier key.
• Feat: add 'remove' key action to allow removing selecting points. By default, to rgitemove selected points hold down ALT and then lasso around selected points. (#105)

Why is it necessary?

Fixes #186
Fixes #105

Examples

Illustrating the brush and rectangle lasso types. When holding down ALT (by default), you can remove points from the selection (new). And when holding down CMD (by default), you can add points to the selection (existed before).

Screen.Recording.2025-01-19.at.1.39.43.PM.mp4

Checklist

• Provided a concise title as a semantic commit message (e.g. "fix: correctly handle undefined properties")
• CHANGELOG.md updated
• Tests added or updated
• Documentation in README.md added or updated
• Example(s) added or updated
• Screenshot, gif, or video attached for visual changes