Change all occurences of Murder.Core.Vector2 into System.Numerics.Vector2

[saint11]

And create all appropriate helpers as extensions.
Using System.Numerics.Vector2 will allow us to use hardware acceleration with vector math and will make things easier to integrate with other libraries.

[dgoelitz]

This project looks awesome! I noticed this because of the "good first issue" tag. I've never contributed to open source before but I've just used C# in my day job for two years. I'll give it a whirl if that's ok.

[saint11]

Sounds great :) Feel free to ask for help here or on the discord if you need

[saint11]

Solved by #21
This will break assets!
If you want to keep you assets I recommend replacing all occurrences of Murder.Core.Geometry.Vector2, Murder with System.Numerics.Vector2, System.Private.CoreLib in your JSON files