Filled Polygon Option

[opiateblush]

• added simple fill option for polygons, similar to the filled ellipse
• the polygon's boundary must be drawn even in the filled case, as the scanline filling algorithm cannot handle multiple vertices on a straight line

[opiateblush]

this might partly solve #53

[johnnychen94]

@ashwani-rathee can you help review this?

[opiateblush]

It's been quite some time, is there any problem with my implementation? I'm fairly new to the pull request business, so I hope it's ok to ask if there is something wrong.

[babaq]

This PR would be very useful for us to fill contours, instead of PyCalling to skimage.draw polygon of our current approach. I have tested on our data, it works and looks identical to the result using skimage.

[ashwanirathee]

Let me review this today, we should have this soon

[babaq]

Can we merge this branch and tag a new release, seems straightforward to review the small amount of code change.

[ashwanirathee]

Give me 2-3 days time, I'll review and we can get a new version asap

[opiateblush]

Those commits were from me, btw. Unfortunately, i made them with a different account, which I usually use for work stuff.