All throw's use Error instances

[wimrijnders]

Throw statements shouldn't be using bare strings; Motivation.

[yotamberk]

@mojoaxel These kind of style changes are legit to your taste? This is only in the Graph3d so I don't know if you meant that these style fixes should be across libs or per lib.

[wimrijnders]

I don't consider this a style change. This improves the way that the code interacts with the browser, which is essential for e.g. debugging. Please read the motivation link.

Also, I have no intention of changing anything outside of Graph3d. If you can agree with the motivation, perhaps an effort can be made for globally changing all throw's. But I'm not sure that I want to do it.

[yotamberk]

I understand and agree with this change. I just want to make sure with @mojoaxel that we are on the same mindset. I'd like his opinion before we merge it.

[wimrijnders]

Hokay. I'm preparing PR5 in the meantime.

[mojoaxel]

I also did not consider this a style change. This is good and useful.
The only problem I see is that it maight be considered a breaking change on some browsers, but I don't think that is realy a problem. So let's go for it!