OpenIK 0.3.0

OpenIK 0.3.0 gives you more control over when solvers run: the new Update Mode and Apply Mode settings let a
solver do everything each frame, or let your own scripts call Solve() and Apply() when they want. The old 'SolveOnly' and 'SolveAndApply' settings are removed.

This changes the API, so check the changelog
if you have custom scripts or solvers.

The update also fixes the Jacobian solver drifting on long ball socket chains and improves the docs and method/fields naming across the Solver and Constraints API

Install with https://github.com/WouterApts/openik-unity.git#v0.3.0, and reimport the samples if you had older ones.