Custom libs

[MerlinEgalite]

To do:

• Finish math lib -> revert on denominator == 0
• Test math lib (or use OZ one?)
• Test Transfer lib

[pakim249CAL]

I'm sure it's a tired stance at this point, but I think that it's almost always better to import and use battle tested code like OZ rather than try to build and use our own if they accommodate our use cases.

Only saying this because the description of this PR is asking.

[MerlinEgalite]

I'm sure it's a tired stance at this point, but I think that it's almost always better to import and use battle tested code like OZ rather than try to build and use our own if they accommodate our use cases.

Only saying this because the description of this PR is asking.

The issue with OZ is that much of the logic is useless for us and add a lots of complexity