Open3spn2

Optimizes non-bonded exclusion setup
Removes X3DNA dependency
Moves CI from travis to github actions
Converts parameter to KJ/mol (openMM and literature default)

Fixes shear, stretch, stagger, buckle, propeller, and opening parameters for X3DNA template creation

Adds topology creation as part of DNA creation

- Adds conda compatibility

-Adds the project to pip
-Adds documentation