N-Gons Primitive: Added new parameters to create n-gons

[micheus]

Yeah. You are right about 20 be a lower value.

I had already increased it for the PR, but I forget to update the file - I made it now.

The value was increased to 100, since using a higher value doesn’t seem to make sense; otherwise, a cylinder might work fine.

The use of a slider indicates that the value represents a range.