Add a snap to grid function for tangram puzzle

[PopeSpaceous]

Currently the tangram puzzle has a wonky snap to grid.
When it uploads a tangram from the file (grey tangram) it sometimes has gaps in between.
The user's tangrams (coloured ones) don't snap exactly to the grid the same way and doesn't line up.

[jespirit]

Just tried the first level on Unity WebGL and I see what you mean. I'll take a look at the code but no promises though.

[PopeSpaceous]

@jespirit the Unity WebGl is not a great example, try the game out either through the release build (if you have windows) or by pulling the repo and trying it in unity.
The Tangrams have a function to read pre-made coordinates from a file, so they would normally be arranged.
But feel free to take a look. Here's a great example of the snap to grid function working. http://wiebke-koepp.de/
Let me know if you need any help understanding the code, as I was the one who wrote it.