Rendering Features Improvements

[erayzesen]

This PR is aimed at improving rendering features.

Vector Rendering

• Make particle rendering optional.
• Allow polygon collision to be optionally disabled, so polygons can be used only for rendering in PBD-type soft bodies.

Debug Rendering (Editor)

• Particle index numbers should be optionally visible. (Closes the issue mentioned here: Add a hover overlay in the editor to show particle/spring index #9 (comment) )
• Inspector settings like "Enable Polygon" and "Enable Spring," originally designed for other purposes, currently serve only to toggle their visibility in debug rendering. Rename them to "Show Polygon" and "Show Springs" for clarity.